Posted by Millie on Thursday, October 13, 2011 at 8:21pm.
A ball is thrown horizontally from the roof of a building 55 m tall and lands 50 m from the base. What was the ball's initial speed?

Physics  bobpursley, Thursday, October 13, 2011 at 8:29pm
how long does it take to hit the ground?
h=1/2 g t^2
55=4.9 t^2 solve for time t.
horizontal distance= speed*time
solve for speed.