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A force of 2 hati + 3 hatj + 4 hatk N ac...

A force of `2 hati + 3 hatj + 4 hatk N` acts on a body for `4` second and produces a displacement of `(3 hati + 4 hatj + 5 hatk)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. vec s)/(t) = ((2 hati + 3 hatj + 4 hatk).(3 hati + 4 hatj + 5 hatk))/(4)`
`= (38)/(4) = 9.5 W`
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