91Ó°ÊÓ

Rotational kinetic energy is caused due to rotation of an object. It is proportional to the rotational inertia and the square of the magnitude of the angular velocity.

Mathematically,

\(K.E{._{rot.}} = \frac{1}{2}I{\omega ^2}\)

Here;

I is the moment of inertia and

\(\omega\)is the angular velocity

Earlier, the solar system was composed of massive cloud of gas and dust and it was slowly rotating. The cloud started to spin faster when they collapsed under its own gravitational pull, resulting in faster spinning of the clouds. This faster spinning is similar to an ice skater pulling his arms to spin faster. The planet rotated along with all the material that accreted to form the planet. This led to the increase in rotational kinetic energy at present.