A body of mass 'm' dropped from a height 'h' reaches the ground with a speed of 0.8√𝑔ℎ. The value of work done by the air-friction is :

Physics · Work , Power and Energy · kinetic enegy and work engery theorem

JEE Mains 2021

A body of mass 'm' dropped from a height 'h' reaches the ground with a speed of 0.8√𝑔ℎ. The value of work done by the air-friction is :

Options