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Choose the correct answer: A ball colli...

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.

A

(a) 4

B

(b) 5

C

(c) 6

D

(d) ball will not collide with the flag

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