Physics

Am I correct?

Two carts have a compressed spring between them and are initially at rest. One of the carts has total mass, including its contents, of 5.0 kg, and the other has total mass of 3.0 kg. If the 3.0 kg cart is moving at 3.0 m/s after the spring is allowed to push the carts apart, what is the velocity of the 5.0 kg cart after release? The system is closed.
(Points : 1)
-1.8 m/s <-------

-5.0 m/s

-0.56 m/s

-0.0 m/s

A car traveling north at 10.0 m/s crashes into a car traveling east at 15 m/s at an unexpectedly icy intersection. The cars lock together as they skid on the ice. The two cars have the same mass. What is their combined speed after the collision? (Points : 1)
5.0 m/s
15 m/s
9 m/s <-------
25 m/s

asked by Me and I
  1. Once again, it is true again and again:

    Momentum before = momentum after if no EXTERNAL force on system, like here:

    0 = 5 v + 3 * 3

    v = -9/5 = -1.8

    posted by Damon
  2. north momentum = 10 m
    east momentum = 15 m

    final mass = 2 m

    final north v = 10 m/2 m = 5 m/s
    final east v = 15 m/2 m = 7.5 m/s

    |v| = sqrt(25+56.25) = 9.1 so yes

    posted by Damon
  3. OK, thank you, I understand :)

    posted by Me and I
  4. Good, you are welcome :)

    posted by Damon

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    I think I chose the correct answer. In a closed system, two carts have a compressed spring between them. One of the carts has a total mass, including its contents, of 2.0 kg, and the other has total mass of 1.0 kg. Which cart
  2. physics

    A 1.o kg cart A and 2.0 kg cart B are at rest on a frictionless table. A cord and a spring of negligible mass join the two carts. The spring is compressed 0.060m between the two carts until the spring's potential energy is 12
  3. Physics

    As shown in the figure below, we have three air carts (labeled #1, #2, and #3) on an air track. The carts are equipped with spring bumpers so that all collisions are elastic. The masses of the carts are m1 = 5m, m2 = 2m, and m3 =
  4. physics

    two air carts of mass m1=0.84kg and m2=0.42kg are placed on a frictionless track. cart1 is at rest and has a spring bumper of constant force F=690N/m.cart2 has a metal bumper and moves towards cart1 with a speed V=0.68m/s. A) what
  5. Physics

    W have three air carts (labeled #1, #2, and #3) on an air track. The carts are equipped with spring bumpers so that all collisions are elastic. The masses of the carts are m1 = 5m, m2 = 2m, and m3 = m. Initially, cart #1 is given
  6. physics

    The drawing below shows two laboratory carts (each has a mass of 1.0 kg) X and Y in contact with a compressed exploder spring between them. The mass on cart Y is 2.33 kg, distance A is 6 cm, distance B is 9 cm. What mass must be
  7. Physics

    Two carts with the same mass are pushed together with a compressed spring between them. When the carts are let go, both move apart, from the spring force. Which will move with a higher speed? What will be the total momentum of the
  8. physics

    A 2.4-kg cart is rolling along a frictionless, horizontal track towards a 1.3-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart
  9. physics

    A 2.9-kg cart is rolling along a frictionless, horizontal track towards a 1.5-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart
  10. Physics

    A 3.0-kg cart is rolling along a frictionless, horizontal track towards a 1.2-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart

More Similar Questions