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Math Help - Another Physics Question

  1. #1
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    Another Physics Question

    A green 4 kg toy car with a speed of 5 m/s collides head-on with a stationary yellow 1-kg car. After the collision, the cars are locked together with a speed of 4 m/s. How much kinetic energy is lost in the collision?

    a. What is the kinetic energy of the green 4-kg toy car BEFORE the collision?
    b. What is the kinetic energy of the yellow 1-kg toy car BEFORE the collision?
    c. What is the kinetic energy of the two cars AFTER the collision?
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  2. #2
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    Re: Another Physics Question

    KE = \frac{1}{2}mv^2
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    Re: Another Physics Question

    1/2(4)(5)^2=50J
    1/2(1)(0)^2=0J
    1/2(5)(4)^2=40J

    Lost in collision 50-40=10 J

    Is this correct
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    Re: Another Physics Question

    Quote Originally Posted by Louisana1 View Post
    1/2(4)(5)^2=50J
    1/2(1)(0)^2=0J
    1/2(5)(4)^2=40J

    Lost in collision 50-40=10 J

    Is this correct
    Well I'm excited. You even included the units! (Most don't.)

    Yes, your answers are correct. Good job!

    -Dan
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