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 ?

If a projectile is projected with initial velocity 98 m/s in a directi

1.	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 ?
Answer» Time of flight is 100 s Time of flight is 10 s Time of flight is 5 s Time of flight IS0 . 5 s SOLUTION :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`