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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

`1 m//s^2`

B

`7 m//s^2`

C

`sqrt 7 m//s^2`

D

`5 m//s^2`

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