A bullet of mass `'m'` fired with a velocity `'v'` into a fixed log of wood and penetrates a distance `'s'` before coming to rest. Assuming that the path of the bullet in the log of wood I horizontal, the average resistance offered by the log of wood is

Options

A. `(m v)/(2 s^(2))`
B. `(m v^(2))/(2s)`
C. `(2s)/(m v^(2))`
D. `(m s^(2))/(2v)`

Answer

B

Explanation

`W = F xx S = Delta K.E`