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A boy reaches out of a window and tosses a ball straight up with a speed of 15 m/s. The ball is 20 m above the ground as he releases it. Use energy to find the following.

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The following what? How high it goes above the ground? Call that height Ymax.

g*H + Vo^2/2 = g*Ymax

H = 20 m
Vo = 15 m/s
g = 9.81 m/s^2
Solve for Ymax

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