A 5.0 kg block starts at rest and slides down a frictionless track except for a small rough area on a horizontal section of the track. It leaves the track horizontally, flies through the air, and subsequently strikes the ground at a distance of L=1.6m from the base of the track.
A) What is the velocity of the block as it leaves the track?
B) How much work is done by the force of friction as the block moves through the rough area?
C) At what height h above the ground is the block released?
D) How much work is done by the gravity force through the entire process?