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A ball is projected from a building of h...

A ball is projected from a building of height `20m` at a speed of `3m//sec` making an angle of `30^(@)` with the horizontal. Then :

A

Time after which ball strike the gorund is 4 sec

B

Ball comes to a height of `20m` again after 3 sec.

C

Value of `beta` is `tan^(-1)((5sqrt(3))/9)`

D

Value of D is `60sqrt(3)m`

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