, , The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretche...

, , The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential energy stored in it is :-
(1) 4 U
(2) 8 U
(3) 16 U
(4) U/4,
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