Recall the portion of the video in which the girl pushes her brother on the sled at constant velocity. the pushing force she exerts on the sled is the frictional force the ground exerts on the sled.
a) less than
b) equal to
c) greater than

option (b) is correct.

Explanation:

As the sled is moving with constant velocity, it means the net force on the sled is zero. It shows that the net force on the sled is zero and hence the applied force is equal to the friction force acting on the sled.

Option (b)

there are no components of a physical goal mentioned on the list of choices that you've provided.