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A ball is projected vertically up with a...

A ball is projected vertically up with an initial speed of `20m//s` on a planet where acceleration due to gravity is `10m//s^(2)`
(a) How long does it takes to reach the highest point?
(b) How high does it rise above the point of projection?
(c) How long wil it take for the ball to reach a point `10m` above the point of projection?

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The correct Answer is:
(a) t=2s, (b) h=20m, (c) 3.41s
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