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15 June, 13:39

What is the magnitude of the average force required to stop an 1200 kg car in 9.0 s if the car is traveling at 80 km/h? Express your answer using two significant figures.

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  1. 15 June, 13:54
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    Answer: 2960N

    Explanation:

    According to newtons first law of motion, force = mass * acceleration

    To get acceleration,

    Acceleration = velocity/time

    Velocity = 80km/hr

    Converting the velocity to m/s

    80*1000/1*3600

    velocity = 22.2m/s

    Time = 9secs

    Acceleration=22.2/9

    Acceleration = 2.47m/s²

    The get the force

    F = 1200*2.47

    F = 2960N
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