A large truck breaks down out on the road and receives a push back into town by

Question

A large truck breaks down out on the road and receives a push back into town by a small compact car as shown in the figure below. While the car, still pushing the truck, is speeding up to get up to cruising speed: (A) the amount of force with which the car pushes on the truck is equal to that with which the truck pushes back on the car. (B) the amount of force with which the car pushes on the truck is smaller than that with which the truck pushes back on the car. (C) the amount of force with which the car pushes on the truck is greater than that with which the truck pushes back on the car. (D) the car's engine is running so the car pushes against the truck, but the truck's engine is not running so the truck cannot push back against the car. The truck is pushed forward simply because it is in the way of the car. (E) neither the car nor the truck exert any force on the other. The truck is pushed forward simply because it is in the way of the car. After the car reaches the constant cruising speed at which its driver wishes to push the truck: (A) the amount of force with which the car pushes on the truck is equal to that with which the truck pushes back on the car. (B) the amount of force with which the car pushes on the truck is smaller than that with which the truck pushes back on the car. (C) the amount of force with which the car pushes on the truck is greater than that with which the truck pushes back on the car. (D) the car's engine is running so the car pushes against the truck, but the truck's engine is not running so the truck cannot push back against the car. The truck is pushed forward simply because it is in the way of the car. (E) neither the car nor the truck exert any force on the other. The truck is pushed forward simply because it is in the way of the car.

Explanation / Answer

Question 15 ) Answer) option A)

Reason : according to Newton's third law, for every action there is an equal and opposite reaction ,

So when the car pushes the truck with a force , then the same amount of force is applied by truck on car

Since the external forces are not acting , momentum is also conserved in above situation

Question 16 ) answer) option A)

Reason : since car reaches constant speed, so acceleration is equal to zero and also according to Newton's third law ,the amount of force with which the car pushes on the truck is equal to that with which the truck pushes back on the car.

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