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A ball is thrown vertically upwards with an initial velocity of 10 m/s, from a platform...

A ball is thrown vertically upwards with an initial velocity of 10 m/s, from a platform that is at a height of 75 m above the ground. The ball reaches a maximum height and, on the way down, misses the platform and falls all the way to the ground. Take the magnitude of the acceleration due to gravity to be 10 m/s2.
(a) What is the velocity of the ball just before it reaches the ground?





(b) How many seconds is the ball in flight?




(c) What is the maximum height above ground reached by the ball?

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