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A Pence consists of a 2 kg of stone attached to the end of a 4.5...

A Pence consists of a 2 kg of stone attached to the end of a 4.5 m long (Mass units) string. When the stone passes
Its Lowest Point has the Speed 8,0 m/s.
( a) the speed of the stone as the string has a 60 ◦ angle against the vertical;
( B) which is the largest angle to the vertical surface of the string of the string during the rowing of the stone?

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