A body is dropped from a height h and touches the ground at a speed of 1.2√gh. The work done by air friction is
Amgh
B0.72 mgh
C0.28 mgh
D- 0.28 mgh
A body is dropped from a height h and touches the ground at a speed of 1.2√gh. The work done by air friction is
Amgh
B0.72 mgh
C0.28 mgh
D- 0.28 mgh