A ball is projected from a top of height, h = 45 m. It is projected horizontally with an initial speed of 30 m/s. Then, which of the following statement is incorrect?

Q. A ball is projected from the ground with a speed of $20m/s$ at an angle of 45 with horizontal. There is a wall of $25m$ height at a distance of $10m$ from the projection point. The ball will hit the wall at a height of

Q. A ball is projected horizontally with a velocity of $5m/s$ from the top of a building $19.6m$ high. How long will the ball take to hit the ground

Q. From the top of a tower of height $200\text{m}$, a ball A is projected up with $10{\text{ms}}^{-1}$ and $2\text{s}$ later another ball B is projected vertically down with the same speed. Then (Neglect air friction)

Q. A ball of mass ${}^{\prime }{m}^{\prime }$ is projected from the ground with a speed ${}^{\prime }{u}^{\prime }$ at an angle ' $\alpha$' with the horizontal. The magnitude of the change in momentum of the ball over a time interval in which it reaches the maximum height 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 $(g=10m/s^2)$