From the top of a tower $20m$ high, a ball is thrown horizontally. If the line joining the point of projection to the point where it hits the ground makes an angle of ${45}^{\circ }$ with the horizntal, then the initial velocity of the ball is:

Q. From the top of a tower $19.6m$ high, a ball is thrown horizontally. If the line joining the point of projection to the point where it hits the ground makes an angle of $45$ with the horizontal, then the initial velocity of the ball is:

Q. From the top of a tower $19.6$ m high, a ball is thrown horizontally. If the line joining the point of projection to the point where it hits the ground makes an angle of ${45}^o$ with the horizontal, then the initial velocity of the ball is?

Q. From the top of a $19.6\text{m}$ high tower, a ball is thrown horizontally. If the line joining the point of projection to the point where it hits the ground, makes an angle of ${45}^{\circ }$ with the horizontal, then the initial velocity of the ball is

Q. From the top of a building $80m$ high, a ball is thrown horizontally which hits the ground at a distance. The line joining the top of the building to the point where it hits the ground makes an angle of ${45}^o$ with the ground. Initial velocity of projection of the ball is $(g=10m/s^2)$

Q. A ball is projected horizontally from the top of the building $19.6m$ high. If the line joining the point of projection to the point where it hits the ground makes an angle of ${45}^{\circ }$ to the horizontal, the initial velocity of the ball is