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    yanelly11 Posts: 1, Reputation: 1
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    #1

    Jan 9, 2012, 06:24 PM
    Physics, 11th grade
    A clay ball with a mass of 0.35 kg has an initial speed of 4.2m/s. It strikes a 3.5kg clay ball at rest, and the two balls stick together and remain stationary. What is the decrease in kinetic energy of the 0.35 kg ball?
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    ebaines Posts: 12,131, Reputation: 1307
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    Jan 10, 2012, 07:31 AM
    Kinetic energy is 1/2mv^2. If the 0.35Kg ball becomes stationary then its velocity is 0, hence it's KE is 0. Can you take it from here?

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