A lightweight object and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill with no air resistance. Which object rises to a
Greater height?
A) They both slide to exactly the same height.
B) The heavy object, because it has more mass to carry it up the hill.
C) The lightweight object, because the force of gravity on it is less.
D) The light object, because gravity slows it down less.
E) The heavy object, because it has greater initial kinetic energy.

Question

A lightweight object and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill with no air resistance. Which object rises to a
Greater height?
A) They both slide to exactly the same height.
B) The heavy object, because it has more mass to carry it up the hill. 
C) The lightweight object, because the force of gravity on it is less.
D) The light object, because gravity slows it down less.
E) The heavy object, because it has greater initial kinetic energy.

Quizplus · Accepted Answer

Since there is no friction or air resistance, both objects will convert their kinetic energy into potential energy at the same rate, regardless of their mass. Therefore, they will reach the same height.

A Lightweight Object and a Very Heavy Object Are Sliding