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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

`7 ms^(-2)`

B

`sqrt(7)ms^(-2)`

C

`5 ms^(-2)`

D

`1 ms^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
C
Average acceleration `=("Change in velocity")/("Time taken")` or `a=(|upsilon_(f)-upsilon_(i)|)/(Delta t)`
`rArr a=(sqrt(30^(2)+40^(2)))/(10)=5 m//s^(2)`
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