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    Shira S's Avatar
    Shira S Posts: 5, Reputation: 1
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    #1

    Dec 16, 2016, 05:56 AM
    Kinetic Energy
    A ping pong pall that is thrown at a velocity of 10m/s at an angle of 30 degrees to the horizontal hits a vertical wall while it is at the peak of it's height, and returns from the wall horizontally. As a result of hitting the wall, the ball loses 20% of its kinetic energy.

    Find:
    A. The height of the wall
    B. The velocity of the ball when it hits the wall
    C. The velocity of the ball after it's collision with the wall
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Dec 16, 2016, 06:34 AM
    Please show us your attempt to work this out yourself. If you get stuck show us where your difficulty is, and we'll help you through it.
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