A stone weighing 2 kg falls from the top...

A stone weighing 2 kg falls from the top of a tower 40 metre heigh and burries itself 1m deep in sand. The time of penetration is :

`(1)/(15)s`

`(1)/(13)s`

`(1)/(14)s`

None of these

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MODERN PUBLICATION-DESCRIPTION OF MOTION IN ONE DIMENSION -Revision Test

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