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18 October, 11:11

A 1200 kg test car is traveling at 25 m/s when it crashes head on into a wall and comes to a stop. if the time of impact is 0.04 s, what is the force acting on the car?

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  1. 18 October, 13:26
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    Given:

    m (mass of the car) = 1200 Kg

    u (initial velocity) = 25m/s

    Time of impact=0.04s

    v (final velocity) = 0.

    Now we know that

    v=u + at

    Where v is the final velocity

    u is the initial velocity

    a is the acceleration

    t is the time of impact

    Substituting these values we get

    0=25+ax0.04

    -0.04 a = 25

    a=-625 m/s^2

    Now we also know that

    F=mxa

    Where F is the force

    m is the mass of the car

    a is the acceleration of the car

    F=1200 x 625

    F=750000N
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