Question: . A ball is launched vertically upwards from a machine on the ground. The height (h metres) after t seconds is given by h =t(4-t)

. A ball is launched vertically upwards from a machine on the ground. The height (h metres) after t seconds is given by

h =t(4-t)

(a) Find when the ball is at a height of 3m.

(b) Why are there two solutions to part b?

(c) Find when the ball is at ground level. Explain.

(d) Find when the ball is at a height of 4 metres.

(e) Why is there only one solution for part (d)?

(f) Is there a time when the ball is at a height of 5m? Explain

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