Find the gravitational field at point P Bonus: Where would you put another mass m to make the field become 0 at P

Describe uniform velocity and variable velocity in short

What is a good example of instantaneous speed

A14 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.