A person of mass `70kg` jumps from a stationary helicopter with the parachute open. As he falls through `50m` height, he gains a speed of `20ms^-1`. The work done by the viscous air drag is

A person of mass 70 kg jump from a 3.0m height

A stone of mass 20 g falling from height of 2 km hits the ground with a speed of 200 ms^-1 . The work done by the gravitational force is

A stone of mass 20 g falling from height of 2 km hits the ground with a speed of 200 ms^-1 . The work done by the gravitational force is

A drop of mass 2.0 g falls from a cliff of height 1.0 km It hits the ground with a speed of 50.0 ms^(-1). The work done by the resistive force is

A drop of mass 2.0 g falls from a cliff of height 1.0 km It hits the ground with a speed of 50.0 ms^(-1). The work done by the resistive force is

A body of mass 10 kg dropped from a height 20 m, acquires a velocity of 10m/s after a falling through a distance of 20m. What is the work done by the air resistance on the body?

A body of mass 5 kg is lifted through a height of 20 m. Calculate the work done by the applied force.

A person brings a mass of 1 kg from infinity to a point P. Initially the mass was at rest but it moves at a speed of 2 ms^(-1) as it reaches at P. The work done by the person on the mass is -3 J. The potential at P is:

A person brings a mass of 1 kg from infinity to a point . Initally the mass was at rest but it moves at a speed of 2 ms^-1 as it reaches A. The work done by the person on the mass is -3J. The potential at A is