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Relative Velocity

An object A i...

Question

An object A is moving with 5 m/s and B is moving with 20 m/s in the same direction. (positive x-axis). Find velocity of B with respect to A.

A

15 m/s

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B

20 m/s

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C

-15 m/s

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D

-20 m/s

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Solution

The correct option is C 15 m/s
Answer is A.
Velocity of B, A and the difference in the velocities are given as follows.
$v_{B} = + 20 m / s v_{A} = + 5 m / s v_{B A} = v_{B} - v_{A} = + 15 m / s$
Hence, the velocity of B with respect to A is 15 m/s.

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