a particle moves with velocity 4i and another particle b moves with a velocity -3j.find vab,vba and their magnitude

Dear student, 

vab=va-vb=4i^--3j^=4i^+3j^vab=42+32=5vba=vb-va=-3j^-4i^=-4i^-3j^vba=42+32=5
Regards.

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