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4 September, 17:33

If a 1500 kg car is moving at 20 m/s and hits a brick wall and you know that it comes to rest in 0.80 s then how much force does the car sustain

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  1. 4 September, 17:49
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    consider the direction towards the wall as negative and away from the wall as positive.

    m = mass of the car colliding with the brick wall = 1500 kg

    v₀ = initial velocity of the car towards the wall = - 20 m/s

    v = final velocity of the car = 0 m/s

    t = time taken by car to come to rest after collision = 0.80 s

    F = force sustained by the car

    using impulse-change in momentum

    F t = m (v - v₀)

    inserting the values

    F (0.80) = (1500) (0 - ( - 20))

    F (0.80) = 30,000

    F = 30000/0.80

    F = 37500 N
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