A crate slides up an inclined ramp and then slides down the ramp after momentarily stopping near the top. This crate is acted upon by friction on the ramp and accelerates both ways. Which statement about this crate's acceleration is correct?
A. The acceleration going up the ramp is greater than the acceleration going down.
B. The acceleration going down the ramp is greater than the acceleration going up.
C. The acceleration is the same in both directions.