Two stones are projected simultaneously from a tower a differenct angles of projection with same speed `'u'`. The distance between two stones is increasing at constant rate `'u'`. Then the angle between the initial velocity vectors of the two stones is `:`

Options

A. `30^(@)`
B. `60^(@)`
C. `45^(@)`
D. `90^(@)`

Answer

B

Explanation

To an observer who starts falling freely under gravity from rest at the instant stones are projected, the motion of ston `A` and `B` is seen as

`(dx)/(dt)=u ....(1)`
`(dl)/(dt)=u ....(2)`
`:. x=l` and `/_BOA =60^(@)`