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A body is moving with velocity 30 m//s t...

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

A

`7m//s^(2)`

B

`sqrt(7)m//s^(2)`

C

`5m//s^(2)`

D

`1m//s^(2)`

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The correct Answer is:
C
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