PHYSICS
posted by TRACY .
A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance.

1/2 m v^2= mgh
v= sqrt (2g*(3+.5))
I am assuming the window on the 4th floor is halfway up.