Energy graphs

Two boxes of equal mass are released from the same point on a ramp. The green box slides without friction down the ramp. The red box has a kinetic force of friction acting on it.

Predict what the graphs of gravitational potential energy, kinetic energy, and total mechanical energy look like for each box as a function of distance. The zero level for potential energy is the bottom of the ramp. The zero for distance is where the blocks start.

Predict what the graphs look like as a function of time.