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A ball is thrown vertically upward from the edge of a cliff, with an upward velocity...

A ball is thrown vertically upward from the edge of a cliff, with an upward velocity of 20 m/s. On its way back down, it just misses the end of the cliff.
(a) Find the position and velocity of the ball 1 s and 4 s after it is thrown;
(b) Find the velocity of the ball when it is 5 m above the flat surface of the cliff. Write the magnitude of the velocity in the Answer box below (unit m/s);
(c) Find the maximum height reached and the time at which it is reached;
(d) Draw the position-time, velocity-time and acceleration-time graphs for this throw (three separate graphs).
Ignore the effects of the air.

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