Work done in raising a box depends on:
Write true or false for each statement:
(a) A coolie does not work against the force of gravity while carrying a luggage on a plane road.
(b) The energy stored in water of a dam is kinetic energy.
(c) The energy of a flying kite is kinetic energy.
(d) Work done by a boy depends on the time in which he does work.
(e) Power spent by a bosy depends on the time for which it does work.
A coolie raises a box of mass 50 kg to a vertical height of 4 m. Calculate the work done by him if the force of gravity on 1 kg mass is 10 N.