Hammer of mass M strikes a nail of mass 'm' with a velocity 20 m/s into a fixed wall. The nail penetrates into the wall to a depth of 1 cm. The average resistance of the wall to the penetration of the nail is

Options

A. `((M^(2))/(M+m))xx10^(3)`
B. `(2M^(2))/(M+m)xx10^(4)`
C. `(M+m)/(M^(2))xx10^(2)`
D. `(M^(2))/(M+m)xx10^(2)`

Answer

B