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A ball of mass 1 m and another ball of mass 2 m are dropped from equal height. If time taken by the balls are 1 t and 2 t respectively, then

1. 2 2 1 t t 
2. 2 1 t t 
3. 2 1 4 t t 
4. 4 2 1 t t 

Correct answer: 2 1 t t 

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