Question

Two rocks of different masses are rolling down a hill at the same speed. Which rock (small one or big one) would have more kinetic energy?

Answer 1

Answer:

The larger rock would roll down the hill faster

Explanation:

Answer 2

Answer:

Kinetic energy of bigger rock will be more than that of smaller one.

Explanation:

Kinetic energy of the rock is given by,

Kinetic energy = $\frac{1}{2} m v^{2}$

As velocity of both the rocks are same. Thus, kinetic energy is directly proportional to the mass of the rock

Kinetic energy ∝ mass

So, For greater mass kinetic energy will be greater and for smaller mass kinetic energy will be smaller.

Hence, Kinetic energy of bigger rock will be more than that of smaller one.