A paving truck with a mass of kg drives in a straight line at 2.5 m/s and dumps kg of gravel on the road, taking negligible time. What is the speed of the truck after dumping the gravel?
Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, the first having a mass of kg and a velocity of , and the second having a mass of kg and a velocity of . What is their final velocity?
A child of mass 32 kg is coasting at 2.4 m/s over flat ground in a wagon of mass 7.6 kg. The child drops a ball of mass 0.83 kg out of the back of the wagon. What is the speed of the wagon after the ball is dropped?