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7 August, 17:40

A 1500 kg truck traveling at 80 km/h collides with another car of mass 1000 kg traveling at 30 km/h in the same direction. The two cars stick together after the collision. Their speed immediately after the collision is

a. 40 km/h

b. 60 km/h

c. 110 km/h

d. 55 km/h

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Answers (1)
  1. 7 August, 17:58
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    Answer: b. 60 km/h

    Explanation:

    Momentum = mass * velocity

    Before collision,

    Momentum of truck is

    1500 * 80 = 120000 kg. km/h

    Momentum of car is

    1000 * 30 = 30000 kg. km/h

    Since they are moving in the same direction, total momentum before collision is

    120000 + 30000 = 150000 kg. km/h

    After Collision, the two cars stick together after the collision. It means that they have a common velocity, V km/h. Therefore, momentum after collision is

    V (1500 + 1000)

    = 2500V kg. km/h

    The law of conservation of momentum states that the total momentum of two objects before collision = the total momentum of the two objects after collision. Therefore

    2500V = 150000

    V = 150000/2500

    V = 60 km/h
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