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A particle moves with a velocity 6hat(i)...

A particle moves with a velocity `6hat(i)-4hat(j)+3hat(k)m//s` under the influence of a constant force `vec(F)= 20hat(i)+15hat(j)-5hat(k)N`.
The instantaneous power applied to the particle is

A

`35(J)//(s)`

B

`45(J)//(s)`

C

`25(J)//(s)`

D

`195(J)//(s)`

Text Solution

Verified by Experts

The correct Answer is:
B
`P=vecF.vecv=(20hati+15hatj-15hatk).(6hati-4hatj+3hatk)`
`=120-60-15=45W`
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