Question

A stone thrown horizontal from the top of vertical wall with a velocity of 15m/s^1 hit the horizontal ground at a point 45m from the base of the wall. Calculate time of flight of the Stone

Answer 1

The horizontal component of the velocity ($v_x = 15m/s$ ) does not change during the falling. Thus, if the stone covered the distance $d = 45m$ during the falling, then it would take the following time:

$$t =\dfrac{d}{v_x} = \dfrac{45m}{15m/s} = 3s$$

Answer. 3s.