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

6 A block of wood of mass 2 kg is suspended by long, light strings and is at rest. A bullet of mass 40 g, strikes and remains in the block, causing it to swing. The maximum height of the block above its rest position is 51 cm. 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 impact.Why are the answers to a) and c) not equal?