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Question

If force is F=(60^i+15^j3^k)N and velocity v=(2^i4^j+5^k)m/s , the instantaneous power is :-

A
195 watt
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B
45 watt
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C
75 watt
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D
100 watt
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Solution

The correct option is D 45 watt
Power is given as P=F.v
Thus, P=(60^i+15^j3^k).(2^i4^j+5^k)=45watt

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