1.

Suppose that water drops are released from a point at the edge of a roof with a constant time interval Deltat between one water drop and the next. The drops fall a distance h to the ground. If Deltat is very short ie the number of drops falling through the air at any given instant is very large then the CM of the drops is very nearly at a height (above the ground ) of

Answer»

`h//2`
`h//3`
`2h//3`
`3h//4`

Solution :The droplets fall a DISTANCE `(1)/(2)g t^(2)` in time t, and the NUMBER of the droplets and hence their mass is proportional to `dt`. COMPUTING the CM of the droplets using the definition, we get the RESULT.


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