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The side of a square is increasing at th...

The side of a square is increasing at ther rate of `0.2 cm//s`. The rate of increase of perimeter w.r.t. time is :

A

`2bhat(j)`

B

`ahat(i)`

C

`(a-2b)hat(i)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
`(dvec(r))/(dt)=ahat(i)-2bt hat(j)` at `t=0, (dvec(r))/(dt)=ahat(i)`
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