Figure shows two trolleys on a level track before and after a collision.
Figure: Two trolleys on a level track before and after a collision

Calculate the momentum of trolley X before the collision.
Calculate the velocity v v\,v of the joined trolleys after the collision.
Give one condition that must be met for the total momentum after the collision to equal the total momentum before it.
40 exam-style questions on AQA GCSE Physics 5.7 Momentum (HT only), covering 5.7.1 Momentum is a property of moving objects, 5.7.2 Conservation of momentum, and 5.7.3 Changes in momentum. Each one has a worked solution and a mark scheme showing where the marks go.