A person is a playing a game that requires throwing an object onto a ledge. The ledge is a distance d and a height d/2 above the release point. You may neglect air resistance. You may use g for the magnitude of the gravitational acceleration (i.e. g=9.81m/s2).

Question

A person is a playing a game that requires throwing an object onto a ledge. The ledge is a distance d and a height d/2 above the release point. You may neglect air resistance. You may use g for the magnitude of the gravitational acceleration (i.e. g=9.81m/s2).
(a) At what angle must the person throw the object and with what magnitude of the velocity if the object is to be exactly at the top of its flight when it reaches the ledge? Express your answer for the speed in terms of the given quantities d and g , as needed.