A) 22.5m
B) 15m
C) 10m
D) 5m
Correct Answer: B
Solution :
General expression for gravitational potential \[\operatorname{V}=\frac{-GM}{x}\] Where x = distance from centre of earth \[\operatorname{V}=\frac{-GM}{{{\left( \operatorname{R}+h \right)}^{2}}}=-5.4\times {{10}^{7}}\] ?(1) negative sign for attractive force \[{{g}_{surface}}=\frac{GM}{{{\left( \operatorname{R}+h \right)}^{2}}}=6\] ?(2) By (1) and (2) 9000km = R + h 9000km = 6400km + h h= 2600kmYou need to login to perform this action.
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