The average force exerted by the wood on the bullet will be

Question

A bullet of mass 0.03 kg moving with speed of 400 m/s penetrates 12 cm into a fixed block of wood. The average force exerted by the wood on the bullet will be

 

         (a) 30 kN                                    (b) 20 kN        

         (c) 15 kN                                    (d) 10 kN