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

Question

Physics

Theresa Morrison

7 August, 14:54

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

+3

Answers (2)

Know the Answer?

Jose Ramsey · Answer 1

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

Rolando Pacheco · Answer 2

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.

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/sB. 110 kgm/sC. 50 kgm/sD. 200 kgm/s

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