The ball should take twice as long to return to its original position as it took to reach its maximum height, so it should return to its original position at 
.
The reason being nuclear reactions are slow in less massive stars than in massive stars hence they age slowly.
Answer:
he does no work on the wall coz wall didn't move
the wall doesn't move so the energy that he use will be wasted
the force that he put on the wall is also zero since the wall didn't move
Answer:
B
Explanation:
because it change heat with the surrounding
