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A particle moving, eastwards with a velocity of $5 m / s$ . In $10 s$ , its velocity changes to $5 m / s$ northwards. The average acceleration in this time is

A

Zero

B

\frac{1}{\sqrt{2}} m / s^{2}

towards north-west

C

\frac{1}{\sqrt{2}} m / s^{2}

towards north-east

D

\frac{1}{2} m / s^{2}

towards north-west

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Solution

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Initial velocity, $u = 5 m / s$ eastwards

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