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A simple pendulum is constructed using a string 85 cm long and a ball having a...

A simple pendulum is constructed using a string 85 cm long and a ball having a
mass of 50 grams. At a certain location near the surface of the earth, the ball
makes 20 vibrations in 38 seconds as it swings along a 5 cm arc. At the same
location, how many vibrations will a 100-gram ball make in a time of 1 minute if the
length of the string is 60 cm and the arc of swing is 10 cm?

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