PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A student drops a ball that bounces off the floor. To relate the ball’s velocity just before and just after the bounce using conservation of linear momentum, which choice of system makes the use of momentum conservation most justified for the bounce interval?
(a) The ball alone
(b) The ball and the air in the room
(c) The ball and Earth
(d) The ball and everything in the classroom