help asap?

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 earth’s velocity. Earth’s mass is 6.0 × 1024 kg. Show all your work, assuming the rock-earth system is closed.

Question

help asap? 

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 earth’s velocity. Earth’s mass is 6.0 × 1024 kg. Show all your work, assuming the rock-earth system is closed.

joannablackwelder · Answer

Momentum = mass*velocity

joannablackwelder · Answer

At rest, the rock had no momentum. After the rock falls 5m it will have a velocity. Thus its momentum changed.

joannablackwelder · Answer

Assuming the rock and the earth are a closed system, all the momentum the rock gained must come from the earth. So, the earth must lose the same amount of momentum.

joannablackwelder · Answer

The change in the magnitude of the earths velocity = absolute value ( change in momentum/ mass of the earth)

joannablackwelder · Answer

Make sense?