a tennis ball is thrown vertically upward from the ground and the student gazing out of the window sees it moving upward pass him at 5 m/sec. the window is 10 m above the ground. how high does the ball go above the ground

Answer 1

V^2 = Vo^2 + 2g*d = 5^2 = 25
Vo^2 - 19.6*10 = 25
Vo^2 = 25 + 196 = 221
Vo = 14.87 m/s.

d = (V^2-Vo^2)/2g.
d = (0-221)/-19.6 = 11.28 m.