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A block of mass m initially at rest is dropped from a height h on to a spring of force constant k . the maximum compression in the spring is x then.

1. 2 2 1 kx mgh 
2. 2 2 1 ) ( kx x h mg  
3. 2 ) ( 2 1 h x k mgh  
4. 2 ) ( 2 1 ) ( h x k x h mg   

Correct answer: 2 2 1 ) ( kx x h mg  

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