I got a question about relative velocities

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velocity of B relative to A is -10 m/s or 10 m/s

i am very confusing this. if i change the question to velocity of A relative to B , IS the answer same as above?~
 

Doc Al

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If the velocity of B relative to A is +10 m/s along some axis, then the velocity of A relative to B will be -10 m/s.
 
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Yes, as Doc has said. Both A and B can consider their own velocity to be zero. They both consider the other to be the one going 10 m/s. There is no law of physics that allows you to make an absolute distinction between who is moving and who is not.
 
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If the velocity of B relative to A is +10 m/s along some axis, then the velocity of A relative to B will be -10 m/s.
what do you mean by along some axis
 
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Yes, as Doc has said. Both A and B can consider their own velocity to be zero. They both consider the other to be the one going 10 m/s. There is no law of physics that allows you to make an absolute distinction between who is moving and who is not.
Thank you i got it
 

Doc Al

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what do you mean by along some axis
A velocity such as -10 m/s only makes sense with respect to some direction.
 

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