Suppose that two objects A and B are moving with velocities v⃗_A and v⃗_B (each with respect to s...

Suppose that two objects A and B are moving with velocities v⃗_A and v⃗_B (each with respect to some common frame of reference). Let v⃗_A B represent the velocity of A with respect to B. Then
(a) v⃗_A B+v⃗_B A=0
(b) v⃗_A B-v⃗_B A=0
(c) v⃗_A B=v⃗_A+v⃗_B
(d) |v⃗_A B| ≠|v⃗_B A|

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