Answer:
(a) Elastic potential energy.
(b) If the stone is thrown without stretching the string of
a catapult, the stone will fall down. The stretched catapult possesses
potential energy due to change in its shape and it throws the stone with high
speed.
(c) Saurabh prevented his friend from aiming at the bird
because he doesn't want to harm or kill the bird.
(d) The quality highlighted in Saurabh's behaviour is care
and love for animals.
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