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Q.

A particle is moving in a circle of radius r centred at O with constant speed v. The change in velocity in moving from P to Q ∠POQ=40∘ is

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a

2vcos40°

b

2vsin40°

c

2vcos20°

d

2vsin20°

answer is D.

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Detailed Solution

V2→=V1→+△V1→ V1→=V2→=V △V→=V2+V2+2.V.V.cosπ-θ=2Vsin θ2=2V sin 200
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