JEE Main 2015 Physics question
A block of mass kg is connected to a spring of unknown spring constant . It is compressed to a distance from its equilibrium position and released from rest. After approaching half the distance from the equilibrium position, it hits another block and comes to rest momentarily, while the other block moves with velocity m s. The total initial energy of the spring is:
Solution
The collision leaves the first block at rest while the second moves off; for a head-on elastic collision this happens only when the two masses are equal, so the second block also has mass 0.1 kg and the first block's speed just before impact was m s. Its kinetic energy there is J.
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