Work and Energy

A girl is carrying a school bag of 3 kg mass on her
back and moves 200 m on a levelled road. The work
done against the gravitational force will be
(g = 10 ms_2)

Which one of the following is not the unit of energy ?

The work done on an object does not depend upon the

Water stored in a dam possesses

An elevator with load, weighing 500 kg is moving
up with a velocity of 0.2 ms-1, The power of the
motor in horse power is (1 H.P. = 746 watt)

A stone rubbed on a rough floor and placed on the
skin will show heating sensation, because.