Question

A ball thrown horizontally at 20 m/s travels a horizontal distance of 46 m before hitting the ground. From what height was the ball thrown?

Answer 1

1st you have to find how the ball to travel the horizontal component.
distance/velocity=time
46/20=2.3
2nd you have to find vertical component of the ball falling
Velocity=time*acceleration
2.3*9.81=22.563
3rd now you have velocity and how long it fell. so now you plug those number into the formula
distance=velocity*time
distance=22.563*2.3

hope this helps. Im in Physics C so this is the easy stuff lol. prepare yourself for the rest of the year...