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				   plz explain about the above topic


6 years ago

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										In non-relativistic kinematics, relative velocity is the vector difference between  the velocities of two objects, as evaluated in terms of a single coordinate system.
For example, if the velocities of particles A and B are $\mathbf{v}_A$ and $\mathbf{v}_B$ respectively in terms of a given coordinate system, then the relative  velocity of A with respect to B (also called the velocity of A relative  to B, $\mathbf{v}_{A/B}$,  or $\mathbf{v}_{A \mathrm{\ rel\ } B}$)  is
$\mathbf{v}_{A \mathrm{\ rel\ } B} = \mathbf{v}_A - \mathbf{v}_B$.
Conversely, the velocity of B relative to A is
$\mathbf{v}_{B \mathrm{\ rel\ } A} = \mathbf{v}_B - \mathbf{v}_A$.
The expression "the velocity of A relative to B" is shorthand for  "the velocity of A in the coordinate system where B is always at rest".

6 years ago

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