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A car moving with a speed of 85 km/h is brought to rest in a didtance of 60 m. How much time did the car take to stop?

  • physics -

    Average speed x time = stopping distance
    The average speed during stopping is half the starting speed, or 42.5 km/h
    85 km/h = 23.6 m/s
    42.5 km/h = 11.8 m/s
    Time = 60m/11.8m/s = 5.1 seconds

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