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A boy is moving with velocity 30 m//s to...

A boy is moving with velocity `30 m//s` towards East. After `10s`, its velocity becomes `40m//s` towards North. The average acceleration of the body is

A

`5 m//s^(2)`

B

`1 m//s^(2)`

C

`7 m//s^(2)`

D

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

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The correct Answer is:
A
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