A boy stands at 39.2m from a building and throw a ball which just passes through a window 19.6 m above the ground , find velocity of projection

Q. Two buildings $A$ and $B$ are $20m$ apart. Building $A$ has a window at a height of $50m$ above the ground and building $B$ has a window at a height of $30.4m$ above the ground. With what speed must a man throw a ball horizontally from the window of building $A$ so that it enters the window of building $B$?

Q. Two buildings $A$ and $B$ are $20\text{m}$ apart. Building $A$ has a window at a height of $50\text{m}$ above the ground, and building $B$ has a window at height $30\text{m}$ from the ground. At what speed must a man throw a ball horizontally from the window of building $A$ so that it enters the window of building $B$. Take $g=10{\text{m/s}}^2$.

Q. Two buildings $\text{A}$ and $\text{B}$ are $20\text{m}$ apart. Building $\text{A}$ has a window at a height of $50\text{m}$ above the ground, and building $\text{B}$ has a window at height $30\text{m}$ from the ground. At what speed must a man throw a ball horizontally from the window of building $\text{A}$ so that it enters the window of building $\text{B}$. Take $g=10{\text{m/s}}^2$.

Q. An object is thrown between two tall buildings $180m$ from each other. The object is thrown horizontally from a window $55m$ above ground from one building through a window $10.9m$ above ground in the other building. Find out the speed of projection. (use $g=9.8$ $m/s^2$)

Q. Two tall buildings are $80m$ apart. The velocity with which a ball should be thrown horizontally from a window $95m$ above the ground in one building so that it will enter a window $15m$ above the ground in the second building is : ($g=10m/s^2$)