A machine for driving a nail into a block of wood causes a hammerhead to drop vertically onto the top of a nail. The mass of the hammerhead is 1.2kg and the mass of the nail is 0.004kg (see diagram). The hammerhead hits the nail with speed vms⁻¹ and remains in contact with the nail after the impact. The combined hammerhead and nail move immediately after the impact with speed 40ms⁻¹.
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