Can someone please help me? Should the speed of the goose be increased or decreased to make the total momentum of the three birds add up to zero? Verify your answer by calculating the required speed.

Asap and show ! a 14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.