A block X slides along a horizontal frictionless surface towards a stationary block Y, as illustrated in Fig. 2.1. [Figure 2.1] There are no resistive forces acting on block X as it moves towards block Y. At time t = 0, block X has momentum 0.40 kg m s⁻¹. A short time later, the blocks collide and then separate. The variation with time t of the momentum of block Y is shown in Fig. 2.2. [Figure 2.2]

1. (a)Define linear momentum.[1]
2. (b)Use Fig. 2.2 to:
3. (b)(i)determine the time interval over which the blocks are in contact with each other[1]
4. (b)(ii)describe, without calculation, the magnitude of the acceleration of block Y from: 1. time t = 80 ms to t = 100 ms 2. time t = 100 ms to t = 120 ms.[2]
5. (c)Use Fig. 2.2 to determine the magnitude of the force exerted by block X on block Y.[2]
6. (d)On Fig. 2.2, sketch the variation of the momentum of block X with time t from t = 0 to t = 160 ms.[3]

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