The force applied to the car by one washer is __kg · m/s2. The force applied to the car by two washers is __kg · m/s2.
The force applied to the car by three washers is __kg · m/s2.
The force applied to the car by four washers is __kg · m/s2.

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

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.