Question

A loaded truck of 2500 kg is moving at a speed of 30 km/h. On the way he stops at a factory and 500 kg of extra weight is placed on it and again he moves with the speed of 30 km/h. Calculate the change in kinetic energy of the truck and also work done by it. Also find out the inference about the change in kinetic energy, due to the increase or decrease of mass. What do you think, is there any change in momentum also. If yes, then how much?

Answer 1

Also, work done= Change in kinetic energy = 17361 Joules. 

Change in kinetic energy also depends on mass. As momentum is directly proportional to mass, so there will be a change in momentum.