(a) Give reason for the following:
(i) The kinetic energy of a freely falling object increases, yet it holds law of conservation of energy.
(ii) A girl fills up 10 pages of a notebook in order to practice sums, yet she has not done ‘work’ in terms of Science / Scientific concept.
(iii) Work done by gravitational force on an object moved along a horizontal path, is zero.
(b) Find the energy in kWh consumed in 24 hours by two electric devices, one of 100 W and other of 500 W.