A block of wood of mass 2kg is suspended by long, light strings and it is at rest. A bullet of mass 40g, strikes and remains in the block, causing it...

A block of wood of mass 2kg is suspended by long, light strings and it is at rest. A bullet of mass 40g, strikes and remains in the block, causing it to swing. The maximum height of the block above its rest position is 51cm. Find:a) the kinetic energy of the bullet plus block immediately after impact.b) the velocity of the bullet at impactc) the kinetic energy of the bullet at impactWhy are the answers to a) and c) not equal?