A body of mass m is placed on the earth’s surface. It is taken from the earth’s surface to a height h=3R . The change in gravitational potential energy of the body is
(a) 2/3 mgR (b) 3/4 mgR
(c) mgR/2 (d) mgR/4
Answer: b
(6)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)