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.

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.