An object is thrown from a point 'A' horizontally from a tower and hits the ground 3s later at B. The line from 'A' to 'B' makes an angle of `30^(@)` with the horizontal. The initial velocity of the object is `15sqrt(x)m//s`. Find x : (take `g=10m//s^(2)`)

Answer

3

Explanation

Time of flight as seen with axis along the incline and perpendicular to incline.
`(2usin30^(@))/(gcos30^(@))=3implies(2xxu)/(10)xx(1)/(sqrt(3))implies3`
`u=15sqrt(3)m//s`