Question

A body of mass m and radius r falls on earth from a great height. If M is mass and R is the radius of earth while then the acceleration of the body when it hits the earth is : (acceleration due to gravity at earth surface is g)

• A. g
• B. 0.98 g
• C. $\frac { \mathrm { g } } { 0.98 }$
• D. 9.8 g

Answer 1

Answer: (B)

0.98 g

Answer 2

a = $\frac { \mathrm { GM } } { ( \mathrm { R } + \mathrm { r } ) ^ { 2 } }$ =

=

= 0.98 g