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) U/4
2) 4U
3) 8U
4) 16U
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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) U/4
2) 4U
3) 8U
4) 16U
4) 16U