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Today, 01:09

A blue train of mass 50 kg moves at 4 m/s toward a green train of 30 kg initially at rest. The trains collide. After the collision the green train moves with a speed of 3 m/s. What is the final momentum of the blue and green train combined?

A. 90 kgm/s

B. 110 kgm/s

C. 50 kgm/s

D. 200 kgm/s

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Answers (2)
  1. Today, 01:42
    0
    D. 200 kgm/s

    Explanation:

    Momentum is conserved.

    Initial momentum = final momentum

    (50 kg) (4 m/s) + (30 kg) (0 m/s) = final momentum

    200 kgm/s = final momentum
  2. Today, 03:53
    0
    D. 200 kgm/s

    Explanation:

    A blue train of mass 50 kg moves at 4 m/s toward a green train of 30 kg initially at rest. The trains collide. After the collision the green train moves with a speed of 3 m/s. Therefore, the final momentum of the blue and green train combined is 200 kgm/s.
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