A .025 kg bullet is moving at 350 m/s when it hits and then passes through a 7 kg block of wood. After the bullet passes through the block the bullet slows to 60 m/s. What is the final velocity of the block of wood after the bullet passes through? (No mass is lost)

The final velocity of the wooden block is equal to

Explanation:

Given that mass of bullet =

                Mass of wood =

               Initial velocity of bullet =

              Final velocity of bullet =

               Initial velocity of wood = o

               Final velocity of wood =

   Here momentum is conserved so initial momentum = final momentum

            .

    Upon substituting these values in above equation , we get

        .

the answer is d. 4

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