The diagram below shows two trolleys, A and B connected to each other by an elastic strip of negligible mass. The trolleys are pulled apart on a smooth plane till tension in the elastic strip is 4.0N and are then released suddenly

The diagram below shows two trolleys, A and B connected to each other by an elastic strip of negligible mass. The trolleys are pulled apart on a smooth plane till tension in the elastic strip is 4.0N and are then released suddenly

​(a) State with reason the total momentum of the trolleys when they are just released (2mks)

​Zero (0) –It is because their velocities are still zero/ They are still stationary

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​(b) Calculate the initial acceleration of trolley A when released (3mks)

(c) The velocity of the trolley B is 0.9ms^-1 just before it collides with A. Determine the velocity of A just before the collision

​(d) Which trolley covers a longer distance before collision? Explain (2mks)

​trolley A, because of it moves with high velocity 

​(e) Explain why the elastic strip may not stretch to the same original length after impact (2mks)

​Friction force

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