Throwing Balls 4

You are initially at rest on a cart which has a solid ceiling, solid floor, and solid walls on all sides except for the right side which has a small aperture. You throw balls at random and some of them eventually exit the cart. Is the cart put in motion?

a) Yes, it moves to the right

b) Yes, it moves to the left

c) No, it remains in place

d) Depends

Solution