How can I find the speed of a rock that is thrown off the top of a 20m building at 15m/s when it makes contact with a bird that is flying at an altitude of 10m above the ground?
A ball thrown horizontally from the top of a building 55m high strikes the ground at a point 35m from the building. What is the (a) time to reach the ground, (b) the initial speed of the ball, and (c) the velocity by which the ball will strike the ground?