After the astronaut applies the force to the keyboard, the astronaut moves

A. faster and upward.

O

B. at a uniform speed and downward.

C. at a uniform speed away from the keyboard.

D. faster and toward the keyboard at a constant rate.

00

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.