Question

The increase in gravitational potential energy of an object of mass m raised from the surface of earth to a height equal to radius R of earth is :

• A. $\frac { \mathrm { mgR } } { 2 }$
• B. mgr
• C. $\frac { \mathrm { mgR } } { 3 }$
• D. $\frac { \mathrm { mgR } } { 4 }$

Answer 1

Answer: (B)

mgr

Answer 2

Increase in potential energy

= –

= $\frac { \mathrm { mR } } { 2 }$

= g × $\frac { 1 } { 2 }$ mR = $\frac { 1 } { 2 }$ mgR