A ball is thrown with a velocity of $8m{s}^{-1}$ making an angle of ${60}^o$ with the horizontal. It's velocity will be perpendicular to the direction of initial velocity of projection after a time of ($g=10m{s}^{-2}$)

Q. A particle is projected with an initial velocity of $200m/s$ in a direction making an angle of ${30}^o$ with the vertical. The horizontal distance covered by the particle in $3s$ is

Q. On an inclined plane of inclination ${30}^{\circ }$, a ball is thrown at an angle of ${60}^{\circ }$ with the horizontal, from the foot of the incline, with a velocity of $10\sqrt{3}{\text{ms}}^{-1}$. Then, the ball will hit the inclined plane in time: (take $g=10m{s}^{-2}$)

Q. A ball is projected with a velocity $20\sqrt{2}m{s}^{-1}$ at angle ${60}^o$ to the horizontal. The time interval after which the velocity vector will make an angle ${30}^o$ to the horizontal is (Take $g=10m{s}^{-2})$

Q. A body is thrown with a velocity of $20m{s}^{-1}$ from a building of height $15m$. If the angle of projection is ${30}^{\circ }$ above the horizontal, the time of flight and the range of the projectile are respectively.
(Take $g=10m/s^2$)