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Question

A jet air plane traveling at a speed of 500 km/hr ejects its products of combustion at the speed of 1500 km/hr relative to jet plane. What is the speed of combustion products w.r.t an observer on the ground?

A
1000 km/hr
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B
500 km/hr
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C
2000 km/hr
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D
5000 km/hr
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Solution

The correct option is A 1000 km/hr
Speed of the jet airplane with respect to ground is, Vjet,g=500 km/h .
Relative speed of its products of combustion with respect to the plane.
Vsmoke,jet=1500 km/h
Speed of its products of combustion with respect to the ground =Vsmoke, grd
Relative speed of its products of combustion with respect to the airplane,
Vsmoke, grd=Vsmoke,jet+Vjet, grd
Vsmoke, grd=1500+500
Vsmoke=1000 km/h

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