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10 September, 03:46

a 1500 kg car traveling at 15 m/s to the south collides with a 4500 kg truck that is intially at rest at a spotlight. The car and the truck stick together and move together after the collison. What is the final velocity of the two-vehicle mass

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  1. 10 September, 03:57
    0
    3.75 m/s south

    Explanation:

    A 1500 kg car traveling at 15 m/s to the south collides with a 4500 kg truck that is intially at rest at a spotlight. The car and the truck stick together and move together after the collison. Therefore, the final velocity of the two-vehicle mass is 3.75 m/s south.
  2. 10 September, 04:14
    0
    3.75 m/s south

    Explanation:

    Momentum before collision = momentum after collision

    m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂

    Since the car and truck stick together, v₁ = v₂.

    m₁ u₁ + m₂ u₂ = (m₁ + m₂) v

    Given m₁ = 1500 kg, u₁ = - 15 m/s, m₂ = 4500 kg, and u₂ = 0 m/s:

    (1500 kg) (-15 m/s) + (4500 kg) (0 m/s) = (1500 kg + 4500 kg) v

    -22500 kg m/s = 6000 kg v

    v = - 3.75 m/s

    The final velocity is 3.75 m/s to the south.
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