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Q.

75% of the power of a  car is used in accelerating it and the rest in overcoming the friction. What is the coefficient of friction if acceleration of the car is 2.45 ms-2

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a

14

b

13

c

512

d

112

answer is D.

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Detailed Solution

power to accelerate the car = mav and power to overcome friction μmgv  given that mavμmgv=7525=31aμg=3 ⇒μ=a3g=2.453×9.8=112
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