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A force of (3hati+4hatj+5hatk) N acts on...

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

A

5 watt

B

7.6 watt

C

8 watt

D

8.4 watt

Text Solution

Verified by Experts

The correct Answer is:
B
`P=w/t=(vecF.vecS)/(t)`
`=((3hati+4hatj+5hatk).(2hati+3hatj+4hatk))/(5)=(6+12+20)/(5)`
`P=(38)/(5)` Watt
`P=7.6` Watt
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