Choose the correct answer:
A ball collides at `B` with velocity `10m//s` at `30^(@)` with vertical. There is a flag at `A` and a wall at `C`. Collision of ball with ground is perfectly inelastic `(e=0)` and that with wall is elastic `(e=1)`. Given `AB = BC=10 m`. Find the time after which ball will collide with the flag.

Options

A. 4
B. 5
C. 6
D. Ball will not collide with the flag

Answer

C

Explanation

As horizontal velocity (i.e velocity along the surface) remains constant so required time `= (30)/(5) = 6s`