A bullet fired at a wooden block of thickness 0.15m manages to penetrate the block. If the mass of the bullet is 0.025kg and the average resisting force of the wood is 7.5 x 10³N, calculate the speed of the bullet just before it hits the wooden block.

• A.450ms^-1
• B.400ms^-1
• C.300ms^-1
• D.250ms^-1
• E.