A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a leveled road. If the value of g be 10 m/s², the work done by the girl against the gravitational force will be:

A. 6000 J B. 0.6 J

C. 0 J D. 6 J

In case of negative work, the angle between the force and displacement is:

A. 0^o B. 45^o

C. 90^o D. 180^o

An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both the spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same:

A. Acceleration

B. Momentum

C. Potential energy

D. Kinetic energy

The work done on an object does not depend on the:

A. Displacement

B. Angle between force and displacement

C. Force applied

D. Initial velocity of the object

Water stored in a dam possesses:

A. No energy

B. Electrical energy

C. Kinetic energy

D. Potential energy