A ball is thrown toward a cliff of height h with a speed of 30 m/s and an angle of 60degrees above horizontal. It lands on the edge of the cliff 4.0 s later.What was the maximum height of the ball?(adsbygoogle = window.adsbygoogle || []).push({});

I try using this equation:

y_f=y_i+v_iy(deltaT)+.5a_y(deltaT)^2

for y_i, i have 0

for v_iy i have 25.5

for (deltaT)i have 4s

and a_y=9.8

I am not getting the right answer, why not?

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# Motion in 2D

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