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NEET 2009 Physics question

PhysicsSystems of Particles and Rotational MotionNEET 2009

A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has force constant value k. The mass is released from rest with the spring initially unstretched. The maximum extension produced in the length of the spring will be:

Answer: (1)

Solution

Let the maximum extension be x. At the lowest point the block is momentarily at rest, so by conservation of energy the loss of gravitational potential energy equals the elastic energy stored: . Option (1). Note that (option

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Question ID VK-090184