A body of mass m rises to height h = R/5 from the earth’s surface, where R is earth’s radius. If g is acceleration due to gravity at earth’s surface, the increase in potential energy is
(a) mgh (b) 4/5 mgh
(c) 5/6 mgh (d) 6/7 mgh
Answer: c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a