A body dropped from a height H reaches the ground with a speed of 1.2 `sqrt(gH)`. Calculate the work done by air friction.

A body dropped from a height 'H' reaches the ground with a speed of 1.1 sqrt(gH) . Calculate the work done by air friction :

A body dropped from a height 'H' reaches the ground with a speed of 1.1 sqrt(gH) . Calculate the work done by air friction :

A body of mass 'm' drpped from a height 'h' reaches the ground with a speed of 0.8 sqrt(gh) . The value of warkdone by the air-friction is ,

A body of mass 'm' drpped from a height 'h' reaches the ground with a speed of 0.8 sqrt(gh) . The value of warkdone by the air-friction is ,

A body of mass .m. dropped from a height .h. reaches the ground with a velocity sqrt((gh)/(2)) . The work done by air resistance is

A body of mass m when released from rest from a height h, hits the ground with speed sqrt(gh) . Find work done by air resistance force.