Two students stand on a small cart that can roll without friction on a horizontal track
PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
Two students stand on a small cart that can roll without friction on a horizontal track. They push each other apart for a short time and then remain standing. For which of the following choices of system is the total horizontal linear momentum guaranteed to stay the same throughout the push?
(a) Each student considered separately
(b) Both students together, excluding the cart
(c) Both students together with the cart
(d) The cart alone