00:01
Here we have a car which collides with a truck and we have to find the following, sorry, find the correct statements regarding the momentum during the collision.
00:13
So the first statement statement a, it says that momentum of the car is conserved.
00:21
Now, from conservation of angular momentum, we know that the momentum is conserved when there is no external force on a system.
00:32
So here we are talking about the car.
00:35
So we take car as a system.
00:38
Now when the car collides with the truck, when the car collides with the truck, the truck exerts force on the car.
00:52
And since we are talking only about car, the car is a system and there will be external force by the truck on the car.
00:59
So in presence of external force, the momentum cannot be conserved.
01:06
So the momentum of car is not conserved.
01:09
So statement a is, the momentum of car is not conserved.
01:11
Is wrong.
01:14
Now statement b says the car and the truck must undergo the same change in speed.
01:21
Now from momentum conservation, the initial momentum of system of car and truck, initial momentum of car plus initial momentum of truck equal to final momentum of car plus final momentum of so the momentum is conserved for the system of car and truck, not individual...