# A particle is moving along a circular path with a constant speed 30 m/s.

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A particle is moving along a circular path with a constant speed 30 m/s. What is change in velocity of a particle, when it describes an angle of 90° at the centre of the circle?

A) zero

B)30√2 m/s

C) 60√2 m/s

D) $$30\over \sqrt2$$  m/s

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Correct Answer is option B) $$30\sqrt2$$