question_answer

A body of mass m falls from a height R above the surface of the earth, where R is the radius of the earth. What is the velocity attained by the body on reaching the ground? Acceleration due to gravity on the surface of the earth is g?

A)  \[gR\]                                  

B)  \[\sqrt{gR}\]  

C)  \[\sqrt{\frac{g}{R}}\]                    

D)         \[\frac{g}{R}\]