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B Max speed of a pendulum

  1. Dec 22, 2016 #1

    Dvd

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    I was given the question "Calculate the maximum speed of a the 100 gram pendulum mass when it has a length of 100 cm and an amplitude of 50 cm" I know one supposed to us the conservation of mechanical energy and some trigonometry. I got the equation √2ghi(maximum height) = vf. How do I find hi to plug into the equation
     
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