A particle moves towards east with velocity $5\ m/s$ . After $10\ seconds$ its direction changes towards north with same velocity. The average acceleration of the particle is 

  • A

    Zero

  • B

    $\frac{1}{{\sqrt 2 }}\ m/s^2\ N-W$

  • C

    $\frac{1}{{\sqrt 2 }}\ m/s^2\ N-E$

  • D

    $\frac{1}{{\sqrt 2 }}\ m/s^2\ S-W$

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