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Question

An aircraft of mass $$m$$ travels through a distance $$s$$ on a runway having a coefficient of friction $$\mu$$, takes off with a velocity $$v$$ in $$t  sec$$. The average power of the aircraft is:


A
mv2
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B
mv2/t
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C
(2μkmgs+mv2)/2t
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D
(μkmgs+mv2)/t
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Solution

The correct option is B $$(2\mu_{k} mgs + mv^{2}) / 2t $$
Work  done by engine=$${\mu_{k}}mgs+\frac{1}{2}m{v}^2$$
power =$$\dfrac{{2\mu_{k}}mgs+m{v}^2}{2t}$$

Physics

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