Question

Two projectiles are projected simultaneously from the top and bottom of a vertical tower of height `h` at angles `45^(@)` and `60^(@)` above horizontal respectively.Body strike at the same point on ground at distance `20m` from the foot of the tower after same time.
The time of flight of projectles is
A. `(3)^(1/4)`
B. `2(3)^(1/4)`
C. `3(3)^(1/4)`
D. `4(3)^(1/4)`

Answer 1

Correct Answer - B
`R_(1)=(U cos theta)t=U/sqrt2sqrtsqrt3`
`U/sqrt(2)2sqrtsqrt3=20,U=(10sqrt2)/(root(4)(3)) U/V=1/sqrt2`