Acceleration is a change in speed or direction over time. In what two ways does the sled accelerate as it descends?

By force and sloppy surface.

Explanation:

By applying force on the sled and slope of the path are the two ways the sled accelerate as it descends. If there is more friction between sled and the ground then force is required to push the sled to move downward while on the other hand, if the path on which sled moves is sloppy then it will move automatically without the use of force, so these two ways can accelerate the sled.

be subject to a force andchange its motion

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s