physics

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to qualify for a race, a car must average 350 km/hr for four laps. If a driver averages 285 km/hr for the first two laps, what average speed must be achieved for the final two laps in order to qualify?

  • physics -

    avg speed=distance/time

    350=4laps/(time2+time4)

    time for first two time2=distance/285=2laps/285

    time for last two laps=2laps/V

    350=4/(2/285+2/V)

    2/285+2/V=4/350

    2/v=4/350-2/285

    1/V=2/350-1/285

    V=350*285/(2*285-350) and you can finish it.

  • physics -

    453.41

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