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science

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a car of mass 900 kg moves at 10 m/s. what is the braking force required to stop the car in a time of 5 seconds?

  • science -

    Find the required acceleration.

    a = (Vf-Vi)/t

    where Vf = final velocity and Vi = initial velocity

    You want final velocity to be 0.

    a = (0-10)/5
    a = -2 m/s/s

    Now to find the force:

    F = ma
    F = 900*-2
    F = -1800N

    The force required is 1800N applied opposite from the direction of motion.

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