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A force 2hati+3hatj+4hatk N acts on a bo...

A force `2hati+3hatj+4hatk` N acts on a body for 4 sec, produces a displacement of `(3hati+4hatj+5hatk)`m. the power used is

A

9.5 W

B

7.5 W

C

6.5 W

D

4.5 W

Text Solution

Verified by Experts

The correct Answer is:
A
`P = vecF.vecv = vecF .(vecS)/t`
`=(2hati+3hatj+4hatk).(3/4 hati+hatj+5/4hatk)`
`=3/2 +3+ 5 = 9.5 W`
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