Bai Yan's pupils shrank suddenly.

Without hesitation, he pushed aside the passers-by who were gathered in front of the window and looked downstairs.

The woman in the red dress was ...... at this time

He had fallen in a pool of blood.

Bai Yan's face instantly became extremely ugly.

He said to his girlfriend in a deep voice, "Ah Mei, call 120.!"

After speaking, Bai Yan glanced at the passers-by who had gradually gathered over here, and frowned.

Then, immediately walked down to the second floor without stopping.

At this time, downstairs.

Beside the woman in the red dress, many pedestrians had already gathered.

The woman in red closed her eyes tightly and fell in a pool of blood, and her body was still gushing blood.

The long hair that was scattered had been dyed red with blood.

Some of the timid girls who were watching had already let out an exclamation and covered their eyes in fear.

"Also...... Alive?"

A few big men standing in the front row, look at me, I look at you, no one has the courage to step forward and take a look.

However, the chances of surviving from such a high building are ......

It can be almost zero!

After all, this large commercial building is a full twelve stories high.

"Police, let go, police!"

Just when the onlookers hesitated, Bai Yan, who ran out of breath from upstairs, took out his police ID card and shouted to the onlookers.

The crowd of onlookers consciously made way for Bai Yan.

Bai Yan came to the woman in the red dress, squatted down, first tried her snort, and then pulled her eyelids open.

Under the gaze of the onlookers, Bai Yan shook his head lightly and sighed helplessly.

A middle-aged man asked, "Officer, ...... she?"

Bai Yan smiled bitterly, "I can't save ...... anymore"

Hearing Bai Yan's words, everyone sighed in unison.

On his face, with regret and incomprehension.

Look at this girl who fell from the building, she is about twenty years old, in the mood for love, how could she not think about it, and jumped off the building like this?

Obviously, in the minds of passers-by, this girl in a red dress couldn't think about what was going on, so she chose to commit suicide by jumping off the building.

Bai Yan got up, looked down around the corpse of the girl in the red dress a few times, dragged his chin, and frowned in thought.

Then he looked up and looked at the commercial building that was more than forty meters high. Eventually, he muttered to himself, "Really, is it suicide?"

Bai Yan picked up the phone and called the Qingcheng City Police Station.

"Captain Yang, it's me, Bai Yan!"

"On the side of the Vientiane commercial building in Chengnan District, there has just been a falling case. ”

"It was a young woman who fell from the building. The death has now been confirmed. ”

"I can't tell if this is a suicide or a long-planned ......"

"He kills!" Bai Yan's words were taken by Cheng Nuo.

Cheng Nuo didn't know when, and he also came downstairs.

And behind him, there were also Mu Leng and Su Xiaoxiao's two daughters, as well as Bai Yan's girlfriend.

At this time, Cheng Nuo looked at the corpse lying in a pool of blood with a heavy face, and said in an affirmative tone, "Detective Bai, this falling case is not a suicide, but a ...... He kills!"

Bai Yan turned his head and looked at Cheng Nuo with a serious face, "Cheng Nuo, why are you so sure?"

Bai Yan also suspects that this case of falling from a building may not be a simple suicide case.

But at present, Bai Yan does not have any evidence to prove that this is a homicide.

The specific determination will have to wait for him to get the specific identity information about the deceased.

But what Bai Yan didn't expect was that Cheng Nuo could be sure that this woman was killed by him?

Facing Bai Yan's questioning, Cheng Nuo smiled faintly, pointed to the commercial building, and said slowly.

"Just now we saw the deceased on the second floor, and when he fell from the air, the time he stayed in our sight was about 0.1 seconds. ”

"The building was built to exacting standard specifications. The height of each floor is at 3.10 meters. Up and down floats at 0.02 meters. ”

"Of course, at the entrance on the first floor, there is a flight of stairs with a height of about 0.5 meters. ”

"Well, the height of the whole building is about 47 meters. ”

"The gravitational acceleration of our Qingcheng location is 9.8146 meters per square second. The weather forecast says there is no wind today, so ignore the effect of the wind. ”

"According to the parabolic theorem, h=1/2gt^2, as I mentioned above, the time taken by the deceased in the 3.10 meter displacement on the second floor, that is, on the second floor, was 0.10 seconds. ”

"Approximate conclusions, the deceased's velocity was 29.58 m/s when he reached the top floor of the second floor. ”

It was deduced that the entire process of the deceased's fall from the building took 3.58 seconds. Displacement of 46.68 meters"

"Therefore, the location of the deceased's fall must be on the rooftop of the building!

Cheng Nuo glanced at Bai Yan, who was already stunned and didn't know what to say, and continued to start his reasoning.

"We approximate the fall of the deceased into a flat throwing motion. If the deceased committed suicide, then the trajectory of her fall should be a vertical fall. Or, even if the deceased jumped forward a short distance before committing suicide. Her acceleration in the horizontal direction will only be 0.5 m/s at most. ”

"There is no wind today, and the effect of the wind is negligible. The resistance is too small, and the deceased's falling method is vertical, and the resistance is ignored, which does not affect the final calculation. ”

"After calculation, it can be calculated that if the suicide occurs, the landing position of the deceased should be within 0~3 meters of the horizontal distance of the commercial building. ”

"But now?" Cheng Nuo pointed to the location of the deceased.

"It was clear that the deceased was 10 metres away from the building. It was calculated that the horizontal velocity of the deceased when he fell from the building was about 4 seconds. ”

"Unless it's someone behind the deceased, giving the deceased a huge push. Otherwise, the place where the deceased fell, will definitely not ...... Here!"

Cheng Nuo stared at Bai Yan and said word by word, "This falling case is not an ordinary suicide. Rather, a premeditated ...... Premeditated murder!"

Bai Yan reacted immediately and shouted at the crowd of onlookers. "Everyone should not go near the body to avoid destroying the scene of the crime. ”

After finishing speaking, Bai Yan picked up the phone in his hand.

He was shocked by Cheng Nuo's analysis just now, but he forgot that the call to Captain Yang hadn't hung up yet.

Bai Yan spoke, "Captain Yang, are you still there?"

"Still there?" Captain Yang replied, "Cheng Nuo is next to you?"

Bai Yan glanced at Cheng Nuo, who was carrying his pocket and looking around, as if he was searching for something, and nodded, "Yes, I happened to meet in the mall today." He's there for me right now. ”

Captain Yang's voice suddenly became extremely serious, "Bai Yan, I have already heard Cheng Nuo's analysis of this case just now. Although I wasn't at the scene, I guess the data Cheng Nuo said should be correct, right?"

Although he didn't want to admit it in his heart, in order to solve the case, Bai Yan still nodded and replied, "That's right, I'm not sure about the specific data, but there is no mistake in the analysis!"