Question

A rock is thrown horizontally from a tower at a speed of 10 m/s and it lands 20.0 m from the tower's base.
a) How high is the tower?
b) What is the final velocity of the rock

Answer 1

you can apply $$\rightarrow S=ut$$ to find the time that it takes to hit the ground.
Then use,
$$\downarrow S=ut+\frac 12 at^2$$ to find the height of the tower.
since you know the time of the travel and since the initial vertical velocity = 0, use,$$\downarrow v=u+at$$ to find the final velocity