Sliding on slope

An iron ball on the top of a slope rolls down as in the picture above, where section A and section C have no friction but section B has a small amount of friction. Which of the following statements is NOT correct about the motion and energy of the iron ball? (Ignore the air resistance.)

a) In section A, the speed of the iron ball increases.

b) All of the potential energy of the iron ball on the top of the slope is converted into kinetic energy at the bottom of the slope.

c) If the magnitude of the work done on the iron ball by the frictional force in section B is the same as the magnitude of the kinetic energy of the iron ball at the beginning of section B, then the iron ball will stop at the end of section B.

d) The iron ball bounced back from the spring in section C will roll up to the top of the slope.


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