An airplane travels against the wind in hours and with the wind in the same amount of time. what is the rate of the plane in still air and what is the rate of the wind?

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.