- #1
abcd8989
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4/5 of a string of length L is placed on a smooth table while 1/5 of it hangs freely over the edge of the table, why the minimum PE gained by the string due to a force pulling it so that the whole string is placed on the table is (1/5 m) x g x (1/10 L) (This is the answer, but I don't know why)
(CG of the 1/5 string is considered)
(CG of the 1/5 string is considered)