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A ball is dropped from the top of a building 20 m high. Ignore the effects of air resistance.
3.1 Define the term free fall. (2)
3.2 Calculate the:
3.2.1 Speed at which the ball hits the ground (4)
3.2.2 Time it takes the ball to reach the ground (3)
3.3 Sketch a velocity-time graph for the motion of the ball (no values required). (2)