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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= (vec(F).vec(s))/(t)= ((2hat(i) + 3hat(j) + 4hat(k)).(3hat(i) + 4hat(j)+ 5hat(k)))/(4)= (38)/(4)= 9.5W`
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