A force (4hati + hatj -2hatk) N acting o...

A force `(4hati + hatj -2hatk) N` acting on a body maintains its velocity at `(2hati+2hatj +3hatk)m s^(-1)`. The power exerted is

4 W

5 W

2 W

8 W

Text Solution

Verified by Experts

The correct Answer is:

Here, Force `vecF = (4hati + hatj - 2hatk).(2hati + 2hatj + 3hatk)`
`= (8 + 2 - 6) W = 4W`.

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