Fig. 1.1 shows two trolleys. On the front of trolley A, there is a wooden rod. Trolley B is initially at rest. As trolley A moves towards the right, the rod enters the modelling clay. Trolley A slows down and trolley B starts moving. The trolleys then stick together and continue moving towards the right. [Figure 1.1] Fig. 1.2 shows the speed-time graph for the two trolleys. [Figure 1.2] The trolleys start to collide at time t = 0.30s. At t = 0.50s, the trolleys are moving at the same speed.

1. (a)(i)State how Fig. 1.2 shows that, during the collision, trolley B has a uniform acceleration.[1]
2. (a)(ii)Describe how the graph in Fig. 1.2 shows that the magnitude (size) of the acceleration of trolley B is larger than the magnitude of the deceleration of trolley A.[1]
3. (a)(iii)Calculate the acceleration of trolley B when t = 0.40s.[2]
4. (b)The mass of trolley A = 0.80 kg. The mass of trolley B = 0.60 kg. Show that momentum is conserved in the collision.[2]
5. (c)In another collision between the same trolleys, the rod and modelling clay are not present. Trolley A hits trolley B with the same initial speed. Explain why the force between the trolleys is larger in this collision.[2]

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