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A particle of mass m is dropped from a height a above the ground. At the same time another particle of the same mass is thrown vertically upwards from the ground with a speed of gh 2 . If they collide h ead - on completely ineleastically, the time taken for the combined mass to reach the ground, in units of g h is :

1. 2 1
2. 2 3
3. 2 1
4. 4 3

Correct answer: 2 3

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