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A point object O can move along vertical...

A point object `O` can move along vertical line `AB` as shown in figure . When image of the object is first visible to `D` then it is released at t=0 from rest from `A` . The time for which image is visible to `D` is :

A

`sqrt((6L)/(g))`

B

`sqrt((2L)/(g))`

C

`sqrt((3L)/(g))`

D

`t rarr oo`

Text Solution

Verified by Experts

The correct Answer is:
A

Required time is given by `3L= (1)/(2)gt^(2) implies t=sqrt((6L)/(g))`
`(A)`
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