How will w change if the initial speed of the box at point a is increased by a factor of 2?

“W” will increase four time.

Explanation:

As work done (W) and Kinetic energy (KE) have same units. So, we will deal “W” in terms of “KE”.

                                                       KE = ½ mv^2   ……. (i)

Equation (i) shows that KE is directly proportional to the square of speed. So, if speed is increased two time then “W” will increase four time.

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.