Q 1813334240.     On complete combustion a litre of petrol gives off heat equivalent to
`3 xx 10^7 J`. In a test drive, a car weighing 1200 kg including the mass of
driver, runs 15 km per litre while moving with a uniform speed on a
straight track. Assuming that friction offered by the road surface and air
to be uniform, calculate the force of friction acting on the car during the
test drive, if the efficiency of the car engine were 0.5.

NCERT Exemplar 05/43/SAT

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