math

When a football is kicked with a vertical speed of 20m/s its height h, in meters, after t seconds is given by the equation h = -5t&2 +20t

a ) how long is the football in the air

b ) how long is it kicked is the football at a height of 15 m

How am i supposed to solve this

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  1. I meant h= - 5^2+20t

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  2. a) h = 0 when the ball lands ... 0 = -5 t^2 + 20 t ... solve for t

    b) is unintelligible

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