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A jet airplane travelling at the speed of `500 km h^(-1)` ejects its products of combustion at the speed of `1500 km h^(-1)` relative to the jet plane. What is the speed of the latter with respecct to an observer on the ground ?

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Speed of products `= 500-1500= -1000 kmh^(-1)`, taking the direction of motion of the plane as positive.
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