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10 July, 21:50

A 3,00 kg truck moving at + 10 m/s hits a 1,000 kg parked car in which moves off at + 15 m/s what is the velocity of the truck

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  1. 10 July, 22:32
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    Momentum before collision = momentum after collision

    If

    m₁ = 300 kg

    v₁ = 10 m/s

    m₂ = 1000 kg

    v₂ = 0 as the car was parked

    momemum before collision =

    m₁ v₁ + v₂ m₂ = 3000kgm/sec

    momentum after collision = m₁ v₃ + v₄m₂=

    300v₃+15m/sx 1000kg

    now from the law of conservation of momentum

    momentum before collision = momentum after collision

    3000kgm/s = 300v₃ + 15000kgm/s

    -15000+3000 = 300v₃

    -12000=300v₃

    v₃ = - 40m/s

    the velocity of truck after collision is 40m/s and the negative sign indicates that its a recoil velocity.
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