How to calculate the distance between a moving object and a reference point?
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How can the relative velocity of two moving objects be calculated?
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Muthusamy P, M.Sc. Retired as Head of Department of Physics. Government of Tamilnadu, lndia.
Answered Nov 17, 2016 · Author has 1.9kanswers and 649.6k answer views
Suppose that A’s velocity is u and B’s velocity is v.
This is with respect to some reference frame which is supposed to be at rest.( usually we).
The relative velocity of B with respect A , means A is at rest and observes B’s velocity.
The relative velocity of A with respect to B means, B is at rest and observes A’s velocity.
Hence, to find the relative velocity of B with respect A, we should stop A. For that we apply a negative velocity u ( -u) on A. Now A stops. But the same must be applied to B also..That is B’s velocity is (v-u). The relative velocity of B with respect to A is ( v-u)
Similarly, the relative velocity of A with respect to B is found by stopping B.
The relative velocity of A with respect to B is ( u-v).
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7 ANSWERS

Muthusamy P, M.Sc. Retired as Head of Department of Physics. Government of Tamilnadu, lndia.
Answered Nov 17, 2016 · Author has 1.9kanswers and 649.6k answer views
Suppose that A’s velocity is u and B’s velocity is v.
This is with respect to some reference frame which is supposed to be at rest.( usually we).
The relative velocity of B with respect A , means A is at rest and observes B’s velocity.
The relative velocity of A with respect to B means, B is at rest and observes A’s velocity.
Hence, to find the relative velocity of B with respect A, we should stop A. For that we apply a negative velocity u ( -u) on A. Now A stops. But the same must be applied to B also..That is B’s velocity is (v-u). The relative velocity of B with respect to A is ( v-u)
Similarly, the relative velocity of A with respect to B is found by stopping B.
The relative velocity of A with respect to B is ( u-v).
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