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The relative velocity of a body A with respect to a body B is 5 m/s. The absolute velocity of body B is 10 m/s. Both the bodies are moving in the same direction. What is the absolute velocity of body A?

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The relative velocity of a body A with respect to a body B is 5 m/s. The absolute velocity of body B is 10 m/s. Both the bodies are moving in the same direction. What is the absolute velocity of body A?

(a) 10m/s

(b) 15m/s

(c) -5m/s

(d) 0m/s

I had been asked this question in semester exam.

My question is taken from Motion in a Straight Line topic in portion Motion in a Straight Line of Physics – Class 11

1 Answer

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Correct option is (b) 15m/s

To elaborate: Here we will use the formula for relative velocity, Vector VR = Vector VA – Vector VB. Since both the bodies are moving in the same direction, the velocity vectors are of the same sign. VR = 5, VB = 10, therefore, VA = 15m/s.

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