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A car of mass 400kg and travelling at 72 km/hr crashes into a truck of mass 4000 kg and travelling at 9 km/hr, in

A car of mass 400kg and travelling at 72 km/hr crashes into a truck of mass 4000 kg and travelling at 9 km/hr, in the same direction. The car bounces back at a speed of 18 km/hr. The speed of the truck after the impact is (a) 9 km/hr (b) 18 km/hr (c) 27 km/hr (d) 36 km/hr

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