Answer:
Given, ,m = 20 kg, b = 15m, g = 10 m/s2
Work done = mgh = 20 x 10 x 15 =3000 J
(b) Gravitational PE= Work done = 3000 J
(c) Gravitational PE at a height of 45 m
= mgh= 20 x 10 x 45
= 9000 J
Therefore, PE increases by 3 times.
(d) KE will be maximum just before the body strikes the ground.
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