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`a ball is thrown upward with an intial velocity of 20 m/s from a height of 50 meters. The height of the ball after t

`a ball is thrown upward with an intial velocity of 20 m/s from a height of 50 meters. The height of the ball after t second is given by h(t)= -4.9t2 + 20t = +50. How long will it take, in seconds, will it take for the ball to 60 meters above the ground

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