ejects its
products of combustion at the speed of 
relative to the
jet plane. What is the speed of the latter with respect to an observer on the
ground ?
Answer:
Here speed of jet airplane,
Let 
be the speed of
products w.r.t. the ground.
Suppose the direction of motion
of the jet plane is positive.
Then the relative velocity of
products w.r.t. jet plane is
or 
Negative sign shows that the
direction of products of combustion is opposite to that of the jet plane.
Speed of
products of combustion w.r.t. ground
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