A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s^-2, the work done by her after climbing 2 m will be:

A. 200 J B. 800 J

C. 8000 J D. 2000 J

The momentum of a bullet of mass 20 g fired from a gun is 10 kg m/s. The kinetic energy of this bullet in kJ will be:

A. 5 B. 1.5

C. 2.5 D. 25

Each of the following statement describes a force - acting. Which force is causing work to be done?

A. The weight of a book at rest on a table

B. The pull of a moving railway engine on its coaches

C. The tension in an elastic band wrapped around a parcel

D. The push of a person’s feet when standing on the floor

Which of the following does not possess the ability to do work not because of motion?

A. A sparrow flying in the sky

B. A sparrow moving slowly on the ground

C. A sparrow in the nest on a tree

D. A squirrel going up a tree

A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value for the stone?

A. Its acceleration

B. Its kinetic energy

C. Its potential energy

D. Its weight