Question

A boulder that is resting on the top of a cliff slips over the edge and accelerates towards the ground. As the rock falls, the amount of kinetic energy
A) increases.
B) decreases.
C) stays the same.
D) increases then decreases.

Answer 1

Answer: It increases because the velocity increases. Kinetic energy is maximum when it hits the ground

Explanation:

Answer 2

Answer: Option (A) is the correct answer.

Explanation:

As we know that kinetic energy is the energy obtained by an object due to its motion.

Mathematically,      K.E = $\frac{1}{2}mv^{2}$

where,     m = mass

                v = velocity

So, when rock is falling from top of the ground then there will be an increase in its velocity. As a result, there will also occur an increase in kinetic energy of the rock.

Thus, we can conclude that as the rock falls, the amount of kinetic energy increases.