Question

A rock is thrown horizontally from the top of a cliff 88 m high with a horizontal speed of 25 m/s, what is the direction of velocity?

Answer 1

$v_x=25~\frac ms,$

$v_y=\sqrt{2gh}=48~\frac ms,$

$v=\sqrt{v_x^2+v_y^2}=53.7~\frac ms,$

$\alpha=-\arctan\frac{v_y}{v_x}=-63.4°.$