physics

A 3 kg toy car with a speed of 10 m/s collides head-on with a 2 kg car traveling in the opposite direction with a speed of 3 m/s. If the cars are locked together after the collision with a speed of 4.80 m/s, how much kinetic energy is lost?

  1. 👍 0
  2. 👎 0
  3. 👁 443
  1. find the velocity after collision:

    3*10+2*(-3)=((3+2)V

    V=(30-6)/5=5m/s

    KE= 1/2 m v^2=1/2 (5)(25)=75/2 Joules

    What was the starting energy?
    1/2 (3*100)+1/2*2*9=159Joules
    check my math.

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A 3-kg toy car with a speed of 6 m/s collides head-on with a 2-kg car traveling in the opposite direction with a speed of 4 m/s. If the cars are locked together after the collision with a speed of 2 m/s, how much kinetic energy is

    asked by Samy on July 12, 2020
  2. physics

    a 2kg car moving towards the right at 4 m/s collides head on with a 8 kg car moving towards the left at 2 m/s and they stick together. After the collision, the velocity of the combined boides is

    asked by Mary on June 6, 2010
  3. Physics

    A 4-kilogram mass has a speed of 6 m/s on a horizontal frictionless surface. The mass collides head-on and elastically with an identical 4-kilogram mass initially at rest. The second 4-kilogram mass then collides head-on and

    asked by Hannah on January 17, 2008
  4. physics

    Cars A and B are racing each other along a straight path in following manner: Car A has head start and is a distance dA beyond starting line at t=0. The starting line is at x=o. Car A travels at constant speed vA. Car B starts at

    asked by help on September 27, 2009
  5. 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

    asked by Joe on March 12, 2014
  1. physics

    A car moving with an initial speed v collides with a second stationary car that is 46.0 percent as massive. After the collision the first car moves in the same direction as before with a speed that is 37.7 percent of the original

    asked by Sami on March 24, 2014
  2. 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

    asked by Anonymous on April 2, 2011
  3. physics

    A toy car moving at constant speed complete one lap around a circular track (a distance of 300m) in 30.0s.if the mass of a car is 1.5kg,what is the magnitude of the force that keeps it in a circle?

    asked by feston junior on January 15, 2018
  4. physics

    A 3 kg toy car with a speed of 10 m/s collides head-on with a 2 kg car traveling in the opposite direction with a speed of 2 m/s. If the cars are locked together after the collision with a speed of 5.20 m/s, how much kinetic

    asked by mk on September 18, 2012
  5. 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

    asked by Haya on April 15, 2017
  6. physics

    A toy car (200 g) moves by shooting a plastic ball (50 g) horizontally out the back. The average acceleration of the car is 1.2 m/s2 [E] and there is negligible friction acting on each part of the toy. (a) Draw an FBD for each

    asked by emily on November 3, 2017

You can view more similar questions or ask a new question.