(Answered) A simple pendulum is made is made by tying a 200kg stone to

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A simple pendulum is made is made by tying a 2.00kg stone to a string 4.00m long. The stone is started with an angle 60 degree at initial speed. It is observed to have a speed of v1=8.00m/s when it passes the lowest point. The string is 4m long. What was the initial speed of the stone?

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