posted by .

train car with mass m1 = 521 kg is moving to the right with a speed of v1 = 7.9 m/s and collides with a second train car. The two cars latch together during the collision and then move off to the right at vf = 5.1 m/s.
1)What is the initial momentum of the first train car? I got 4115.9 kg m/s as the correct answer.
2)What is the mass of the second train car?
I don't know how to do the second question please help.

  • Physics -

    1) 521*79 = 4115.9 kg*m/s

    2) 4115.9 = (M1 + M2)*5.1
    M1 + M2 = 807.0 kg
    M2 = 807 - 521 = 286 kg
    ..not very heavy for a railroad car.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    A 1500 kg car moving east at 15 m/s collides with a 1730 kg car moving south at 15 m/s and the two cars stick together. What is the velocity of the cars right after the collision?
  2. physics

    several students are riding in bumper cars at an amusement park. the combined mass of a car A and its occupants is 250 kg. the combined mass of car B and its occupants is 200 kg. Car A is 15 m away from car B and moving to the right …
  3. Physics

    A car with a mass of 1700 kg is traveling directly northeast (45 degrees between north and east) at a speed of 14m/s (31mph), and collides with a smaller car with a mass of 1300kg that is traveling directly south at a speed of 18m/s …
  4. Physics

    The engine is in the back of the train it is pushing. The passengers were in the car closest to the engine. There were five cars in total. The front car had one person in it. When he noticed a semi truck trailer sitting on the track …
  5. physics

    The last car unfastens from a moving train. The train continues to move at the same constant speed. What is the ratio of the paths covered by the train and car up to the moment of the car’s stop?
  6. Physics

    A 1000-kg car moving east at 80 km/h collides head-on with a 1500-kg car moving west at km/h, and the two cars stick together. (a) Which way does the wreckage move and with what initial speed?
  7. physics

    A bumper car with mass m1 = 100 kg is moving to the right with a velocity of v1 = 4.6 m/s. A second bumper car with mass m2 = 86 kg is moving to the left with a velocity of v2 = -3.8 m/s. The two cars have an elastic collision. Assume …
  8. Physics

    A railroad car with a mass of 2.33 × 104 kg moving at 3.71 m/s collides and joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.44 m/s. a) …
  9. Physics

    A 2170 kg car moving east at 10.5 m/s collides with a 3230 kg car moving east. The cars stick together and move east as a unit after the collision at a velocity of 6.00 m/s. a) What is the velocity of the 3230 kg car before the collision?
  10. Physics

    a toy car of mass 0.01 kg, gets into an elastic collision with a toy train mass 0.35 kg. if the train is at rest and the car is moving at 2 m/s initially. how fast is the train moving after the collision?

More Similar Questions