A body is moving with velocity 30 m/s towards east. After 10 seconds its velocity becomes 40 m/s towards north. The average acceleration of the body is :

Question

( A ) $ 7 m/s^2$
( B ) $ \sqrt{7} m/s^2$
( C ) $1 m/s^2$
( D ) $ 5 m/s^2$

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