Question

A ball rolls up a ramp and then back down again. The ramp is oriented so that the ball is rolling to the right as it rolls up the ramp. Assume that positive v and a vectors point to the right. Which statement is true about the ball's horizontal acceleration?
b. The ball has a positive acceleration when rolling up the ramp and a negative acceleration when rolling down the ramp.
c. The ball has a positive acceleration when rolling both up and down the ramp.
d. The ball has a negative acceleration when rolling up the ramp and a positive acceleration when rolling down the ramp.
e. The ball has a negative acceleration when rolling both up and down the ramp.
none of the above

Answer 1

acceleration is the change in velocity.

does velocity increase or decrease when rolling up/down the ramp?

Answer 2

c. The ball has a positive acceleration when rolling both up and down the ramp.