A jet airplane traveling at a speed of ejects its products of combustion at a speed of relative to the jet plane. The speed of the latter with respect to an observer on the ground is:
Step 1: Given data
Speed of jet airplane,
Speed of products combusted with respect to the jet plane,
Step 2: Formula used
Relative motion formula
Step 3: Calculating speed
Relative velocity = Velocity of B -Velocity of A (Vector calculations)
From the diagram we understand, will be negative i.e., .
Speed of products with respect to the observer on the ground,
The speed of products combusted with respect to the observer standing on the ground is equal to in the left direction according to the sign convection.