1.

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     [CPMT 1989; SCRA 1996; DPMT 2001]

A. mgh    
B.             \[\frac{4}{5}mgh\]
C.             \[\frac{5}{6}mgh\]     
D.             \[\frac{6}{7}mgh\]
Answer» D.             \[\frac{6}{7}mgh\]


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