When a spring is compressed by 3cm, the potential energy stored in it is U. When it is compressed further by 3 cm, the increase in potential energy is,

When a spring is compressed by 3cm, the potential energy stored in it

1.	When a spring is compressed by 3cm, the potential energy stored in it is U. When it is compressed further by 3 cm, the increase in potential energy is,
Answer» 4 U U 2U 3U Answer :D