Atrack coach with a meter stick and a stopwatch is trying to determine if a student is walking with constant speed. he

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

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.