If a projectile is projected with initial velocity 98 m/s in a direction of `30^(@)` above the horizontal. For this situation which one of the following is a correct statement ?

Options

A. Time of flight is 100 s
B. Time of flight is 10 s
C. Time of flight is 5 s
D. Time of flight is 0 . 5 s

Answer

B

Explanation

u = 98 m/s
`g = 9 . 8 m//s^(2)`
`theta = 30^(@)`
Time of flight `t_(f) = (2u sin theta)/(g)`
`t_(f) = (2 xx 98 xx sin 30^(@))/(9 . 8 `
`= 2 xx(8 xx 1)/(9 . 8 xx 2) = 10 s`