A group of students are investigating the principle of conservation of momentum using a small truck moving across a frictionless surface. Sand is poured into the truck while it goes past X. At Y, a trapdoor in the base of the truck opens and the sand drops out. How does the velocity of the truck alter when the sand is added to the truck at X and then exits the truck at Y?
Physics 9702 · AS & A Level · Linear momentum and its conservation