A ball is projected upwards from top of tower of height of $45$ m with a speed of $40$ m/s. Find the time taken by it to reach the ground surface.

Q. A ball is projected upwards from top of tower of height of $45$ m with a speed of $40$ m/s. Find the time taken by it to reach the ground surface.

Q. From the top of a tower of height $40\text{m}$, a ball is projected upwards with a speed of $20\text{m/s}$ at an angle of elevation of ${30}^{\circ }$. Then the ratio of the total time taken by the ball to hit the ground to the time taken by the ball to come at the same level as the top of the tower (Take $g=10{\text{ms}}^{-2})$

Q. A ball is projected upwards from the top of a tower with a velocity $50\text{m/s}$ making an elevation angle ${30}^{\circ }$ with the horizontal. The height of the tower is $70\text{m}$. Find time taken by the ball to reach the ground from the instant of throwing.

Q. A ball is projected upwards from the top of a tower of height $40m$ with a speed of $10m/s$, The time it will take to strike the ground $(g=10m/s^2)$ will be

Q. From the top of a tower of height $40m$, a ball is projected upwards with a speed of $20m/s$ at an angle of elevation of ${30}^0$. The ratio of the total time taken by the ball to hit the ground to its time of flight (time taken to come back to the same elevation) is :