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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

(12)

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