Suppose that an object is moving with a constant velocity. make a statement concerning its acceleration

Its acceleration is zero

Explanation:

Acceleration is defined as the rate of change in velocity:

where

v is the final velocity

u is the initial velocity

t is the time

The object in this problem is moving with a constant velocity, so

u = v

which means that the initial velocity is equal to the final velocity: therefore, the acceleration becomes

So, the acceleration is zero.

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.

thermal energy is the answer