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4 November, 17:32

Police are investigating an accident. They know that Tom Brady was driving 20 m/s before being hit by Jay Z head on. Tom Brady's car has a mass of 1100 kg and Jay Z's has a mass of 1475 kg. They also know that the two cars stuck together and were traveling 7 m/s in the same direction as Jay Z was driving. The speed limit was 25 m/s, was Jay Z speeding?

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  1. 4 November, 17:37
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    m = mass of tom brady's car = 1100 kg

    v = initial velocity of tom brady's car before collision = - 20 m/s

    M = mass of jay Z's car = 1475 kg

    V = initial velocity of jay Z's car before collision = ?

    V' = velocity of the combination after collision = 7 m/s

    Using conservation of momentum

    m v + MV = (m + M) V'

    (1100) ( - 20) + (1475) V = (1100 + 1475) (7)

    V = 27.14 m/s
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