Two trolleys are held together on a horizontal surface with a compressed spring between them.
When they are released, the trolleys lose contact with the spring. The trolley of mass 2 kg moves to the left at a final speed of $2m{s^{ - 1}}$.
How much elastic potential energy was stored in the spring?
1 )
4 J
2 )
6 J
3 )
8 J
12 J
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