Who and when was mechanical energy discovered? help me please!​

Explanation:

Thomas Young (1773 − 1829) first introduced the word “energy” to the field of physics in 1800, but the word did not gain popularity. Thomas Young later established the wave nature of light through interference experiments.

June 1849 - James Prescott Joule

Explanation:

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.

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.