Physics

posted by .

A 1000 kg car is moving at a constant speed of 7 m/s when it hits the back bumper of another car with 1200 kg of mass moving in the same direction at a constant speed of 6 m/s. As a result of the collision both bumpers get coupled. Show all work and calculations.
1. What is the combined mass of both cars?
2. What is the combined weight of both cars?
3. What is the total momentum of the system before and after the collision?
4. What is the speed of both cars after the collision?
5. What is the combined kinetic energy of both cars after the collision?

  • Physics -

    Aren't you able to do any of this yourself? Can you add the masses of the two cars?

    Do you know how to compute weight from mass?

    Use the definition of momentum for part 3.

    Use conservation of momentum for part 4.

    Use the definition of kinetic energy and the result of 4. for part 5.

    Show your work if further help is needed.

  • Physics -

    Sorry, I can do part 1 and 2 relatively easily. However, I suck at physics and was honestly hoping to receive an answer like the one you gave me. I just wanted to know how to do it, not necessarily get the answer. Thanks

  • Physics -

    Ok Here are my answers, if you can give me any more help it would be greatly appreciated.
    1. 1000+1200=2200
    2. Fw = ma
    1000*9.8 m/s^2 = 9800
    1200*9.8 m/s^2 = 11760
    Fw = 21,560
    3. Momentum = mv
    1000*7 + 1200*6
    7000 + 7200
    Momentum = 14,200 kg m/s
    4. 14,200 / m1+m2
    14,200 / 1000+1200
    14,200 / 2200
    speed after collision = 6.5

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics..please help?

    At rest, a car’s horn sound at the note A(440Hz) The horn is sounded while the car is moving down the street. A bicyclist moving the same direction with one third the car’s speed hears a frequency of 415 Hz. What is the speed of …
  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 moving at a speed of approximately 176.5 km/h. 923 m in front of the car, there is a truck moving at a speed of 84.2 km/h in the same direction. 1.What is the name of the physical process that would occur if both vehicles kept …
  4. pysic

    A 328 kg car moving at 19.1 m/s hits from behind another car moving at 13.0m/s in the same direction. If the second car has a mass of 790kg and a new speed of 15.1m/s what is the velocity of the first car after the collision?
  5. Dynamics

    Car A is moving at a constant speed Va=75 km/h, while car C is moving at a constant speed Vc=42 km/h on a circular exit ramp with radius p=80m. Determine the velocity and acceleration of C relative to A.
  6. Physics

    A car of mass m moving at a speed v1 collides and couples with the back of a truck of mass 3m moving initially in the same direction as the car at a lower speed v2. (Use any variable or symbol stated above as necessary.) (b) What is …
  7. Physics

    A car of mass m moving at a speed v1 collides and couples with the back of a truck of mass 3m moving initially in the same direction as the car at a lower speed v2. (Use any variable or symbol stated above as necessary.) (b) What is …
  8. Physics

    A car of mass m moving at a speed v1 collides and couples with the back of a truck of mass 3m moving initially in the same direction as the car at a lower speed v2. (Use any variable or symbol stated above as necessary.) (b) What is …
  9. physics

    The driver of a car wishes to pass a truck that is traveling at a constant speed of 19.0 m/s . Initially, the car is also traveling at a speed 19.0 m/s and its front bumper is a distance 24.3 m behind the truck's rear bumper. The car …
  10. Physics

    In an elastic collision, a 300 kg bumper car collides directly from behind with a second, identical bumper car that is traveling in the same direction. The initial speed of the leading bumper car is 4.90 m/s and that of the trailing …

More Similar Questions