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If vec(F ) = (60 hat(i) + 15 hat(j) - 3 ...

If `vec(F ) = (60 hat(i) + 15 hat(j) - 3 hat(k)) N` and `vec(V) = (2 hat(i) - 4 hat(j) + 5 hat(k))` m/s, then instantaneous power is:

A

195 watt

B

45 watt

C

75 watt

D

100 watt

Text Solution

Verified by Experts

The correct Answer is:
B
`P - vec(F).vec(v)`
`= (60 hat(i) + 15 hat(j) - 3 hat(k)) . ( hat(i) - 4 hat(j) + 5 hat(k))`
= (120 - 6- - 15) = 45 watt
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