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Question: once when on vacation in italy i visited a forest...

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Once, when on vacation in Italy, I visited a forest which had many waterfalls. At one of the waterfalls, a long rope hung down from the top of the cliff near the waterfall and had a seat on the bottom. Adventurous visitors could hop onto the seat and swing down into the waterfall as shown in the photo at the right. I estimated that their starting angle was about 20o. I also timed their swing and discovered it took them 8 seconds to swing out and back.

Estimate the length of the rope, L, and the speed, v, with which they passed through the waterfall. (The top of the rope is not shown in the photo.)
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L =  m

v =  m/s

Explain your reasoning.

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