A ball is thrown from ground such that it just crosses two poles of equal height kwpt 80 m apart. The maximum height attained by the ball is 80 m. When the ball passes the first pole, its velocity makes `45^(@)` with horizontal. The correct alternatives is/are :- `(g=10 m//s^(2))`
A. Time interval between the two poles is 4s.
B. Height of the pole is 60 m.
C. Range of the ball is 160 m.
D. Angle of projection is `tan^(-1) (2)` with horizontal.
