A freely falling body takes `4s` to reach the ground. One second after release, the percentage of its potential energy, that is still retained is

For a freely falling body, kinetic energy is……of the ground level.

A freely falling body takes 2 seconds ot reach the ground on a plane, when it is dropped from a height of 8m. If the period of a simple pendulum is 'pi' seconds on the planet. Calculate the length of the pendulum.

A freely falling body takes 2 seconds to reach the ground on a planet when it is dropped from a height of 8m . If the period of a simple pondulum is 2 seconds on that planet then its length is