I'm slightly uselss at projectile motion questions! I can never apply the correct formulae to the given question! My exam is on thursday and i'm freaking out! For example which equation do i use to solve the height of the cliff if the horizontal speed is 22ms-1 and the time taken is 1.5s? i tried d=vt and s=ut+1/2at(t) but keep getting the wrong answer! any hints?