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21 November, 01:21

More damage is done and more life is endangered in a head-on collision of two cars, each traveling at 30 mph, than in a car crashing into a brick wall at 30 mph because:

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  1. 21 November, 03:21
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    Kinetic energy (KE) = 0.5mv^2

    For two cars of equal mass moving towards each other,

    KE = 2*0.5*m*30^2 = 900m J

    For one car hitting a wall, KE = 0.5m*30^2 = 450m J (since the wall is stationary).

    It can be seen that two cars hitting each other head-on, the energy to be dissipated is twice as that to be dissipated for a car hitting a wall. This resuts to more damage as such energy is taken up by the contents in the car.
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