Kicking a football 36m from the goal, which is 3.05m high. The ball leaves the ground with a speed of 20m/s at an angle of 53 degrees to the horizontal. By how much does the ball clear or fall short of clearing the crossbar? delta y = v0cos(theta)delta t The thing is, I don't know delta t, and the equation for delta t I have is delta t = delta x/ v0cos(theta), but the only way of knowing delta x also requires delta t... Can someone please walk me through the problem? (I can do the math myself but just what equations to use and such.) thanks a lot!