Question: A ball is thrown upward with an initial velocity of 20 m/s. (a) How long is the ball in the air? (b) What is the

A ball is thrown upward with an initial velocity of 20 m/s. 

(a) How long is the ball in the air? 

(b) What is the greatest height reached by the ball? 

(c) When is the ball 15 m above the ground?

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