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15 January, 20:26

If Superman wants to slow down a fast car with speed 20 m/s and mass 1000 kg, how much force in N does he need to apply if he wants to get it down to zero within 3.2 seconds?

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  1. 15 January, 21:00
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    Force of 6250N is required to slow down the body to zero.

    Explanation:

    Speed (V) = 20m/s

    Initial speed (u) = 0m/s

    Mass (M) = 1000kg

    Time (t) = 3.2seconds

    Using first equation of motion to find the acceleration of the body:

    V=U + at

    20m/s=0 + a*3.2s

    Therefore, a = (20m/s) / 3.2s

    a=6.25m/s^2

    To find the force required to stop the body or get it down to zero:

    Force (F) = mass x acceleration

    F = (1000kg) * (6.25m/s^2)

    F=6250N.

    Therefore a force of 6250N is required to slow it down.
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