A trolley of mass 1.0kg is moving at 2.0ms−1. It collides with a stationary trolley of mass 2.0kg.

A trolley of mass 1.0kg is moving at 2.0ms−1. It collides with a stationary trolley of mass 2.0kg. This second trolley moves off at 1.2ms−1.

a. Draw ‘before’ and ‘after’ diagrams to show the situation.

b. Use the principle of conservation of momentum to calculate the speed of the first trolley after the collision. In what direction does it move?