Question

A blue train of mass 50 kg moves at 4 m/s toward a green train of 30 kg initially at rest. What is the initial momentum of the blue and green train combined?
A. 20 kgm/s
B. 50 kgm/s
C. 0 kgm/s
D. 200 kgm/s

Answer 1

The correct option is D.   The initial momentum of the blue and green train combined during the collision is 200 kgm/s.

Initial momentum of the blue and green train

Apply the principle of conservation of linear momentum as follows;

Pi = m1v1 + m2v2

where;

• m1 is mass of blue train
• m2 is mass of green train
• v1 is velocity of blue train
• v2 is velocity green train
• Pi is the initial momentum of the two trains

Pi = (50 x 4) + 30(0)

Pi = 200 kgm/s

Thus, the initial momentum of the blue and green train combined is 200 kgm/s.

Learn more about momentum here: brainly.com/question/7538238

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