HELP ME

A.

Explanation:

It says it stops moving, so the mechanical energy is decreasing.

But why would you add energy? That makes the system open, so it can't be B for sure!

It can't be C; how does measuring the energy help store it?

D is just plain absurd; you can't turn matter into energy unless it's nuclear fusion!

Have a great day!

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

it breaks and dirupture other materials and other sencews from the bottom