A bullet of mass 0.05 kg moving with a speed of `80ms^(-1)` enters a wooden block and is stopped after a distance of 0.40 m . The average resistive force exerted by the block on the bellow is

Options

A. A)300 N
B. B)20 N
C. C)400 N
D. D)40

Answer

C

Explanation

Resistive force `=("intial kinetic energy")/("stopping distance")`
`=((1)/(2)xx0.05xx(80)^(2))/(0.40)=400N`