Suppose you have a solid ball, a piece of pipe and a solid disc that have the same mass and diameter. If you roll them all down a hill in a race, which will reach the

bottom first:

a) First the pipe, then the disc, then the ball

b) First the disc, then the ball, then the pipe

c) First the ball, then the disc, then the pipe

d) There will be 3-way tie since they all have the same mass and diameter.