Two particles are moving with velocities v1 and v2. Their relative velocity is the maximum, when the angle between their velocity vectors is
A
zero
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B
π4
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C
π2
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D
π
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Solution
The correct option is Dπ The relative velocity →vr is given by, →vr=→v1−→v2 |→vr|=√v21+v22−2v1v2cosθ So, clearly |→vr| will be maximum when cosθ=−1⟹θ=π ⇒vr=v1+v2 Thus, for maximum relative velocity angle between velocity vectors should be π