Posted by **Kit** on Tuesday, March 12, 2013 at 10:03pm.

A ball is dropped from a height of 20m. When it bounces, it rebounds with a speed that is one half of the speed at which it hits the ground. How high does it bounce?

- Physics -
**Kit**, Tuesday, March 12, 2013 at 10:07pm
A man is standing on a cliff and throws a ball outward 50m/s at an angle of 53 degrees. It hits the base of the cliff in 10 seconds.

Find:

a) The height of the cliff

b) the angle at which the ball goes into the sea

c) if the ball will hit a boat 150m out to sea.

- Physics -
**Laura**, Tuesday, March 12, 2013 at 10:23pm
h(t) = h - g/2to^2

After you drop the ball from a height of 20 feet and it hits the ground, it would reach a height of 15 ft

(just multiply your h by 3/4 each time to get the heights from each time it bounces...

20 * (3/4) = 15ft

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