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Question

If the force F=(60^i+15^j3^k) N and velocity v=(2^i4^j+5^k) m/s, then 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 B 45 watt
Power P=F.v=(60^i+15^j3^k).(2^i4^j+5^k)
P=1206015=45 watts.
Hence, the correct answer is option (b).

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