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A jet aeroplane travelling at the speed of 500 km/hr ejects its products of combusion at speed of 1500 km/hr relative to jet plane. What is the relative velocity of the latter with respect to an observer on the ground?

A jet aeroplane travelling at the speed of 500 km/hr ejects its products of combusion at speed of 1500 km/hr relative to jet plane. What is the relative velocity of the latter with respect to an observer on the ground?

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