Ferb rolls a bowling ball down a ramp

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Ferb rolls a bowling ball down a ramp. There is no friction on this ramp. At a point halfway down the ramp, the bowling ball's kinetic energy is ____________.

a)less than its potential energy at this same point.

b) greater than its potential energy at this same point.

c) the same as its potential energy at this same point.

d) impossible to compare with PE at the same point because we don't know the mass of the ball.

e) impossible to compare with PE at the same point because we don't know the length of the ramp.

f.)Both (d) and (e).