Is their a multiple choice to choose from I'm not sure the answer I got is even right.
That would be very helpful.
Explanation:
W = PE
W = mgh
1500 J = (20 kg) (9.8 m/s²) h
h = 7.65 m
Round as needed.

When two bodies collide with each other in the absence of an external force, then the total final momentum of the bodies is equal to their total initial momentum.
Answer:
Explanation:
Mercury moves the fastest.