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17)

A ball is thrown vertically upwards.

The graph shows the height of the ball above the ground after it is thrown.

a) For how many seconds is the ball at a height of

**more than**2 metres?**[1 mark]**

b) After how many seconds is the ball at instantaneous rest when it is in the air?

**[1 mark]**

c) Work out the average speed of the ball when it is moving downwards

**[2 marks]**