A2.74 g coin, which has zero potential energy at the surface, is dropped into a 12.2 m well. after the coin comes to a stop in the mud, what is its potential energy with respect to the surface?

- 0.328J

Explanation:

POTENTIAL ENERGY = mgh

                                   = 0.00274 × 9.81×12.2  here 2.74g = 0.00274kg

                                   = 0.32792868 J

                                   = 0.328J

AS IT IS BELOW THE SURFACE HENCE MUST BE NEGATIVE

hence potential energy = - 0.328J

4.5 × 10³

Explanation:

F=ma

F = 100*10 × 4.5

F = 4.5 × 10³