Airplane releases a ball as it flies parallel to the ground at a height of 195m, the ball lands on the ground at exactly 195m from the release piont, calculate the speed v of the plane

H=195; x=195

v=x/t. If someting falls down but hast already a certain Speed in a horizontal direction you have to differ between the horizontal and the vertical Speed / acceleration: x=v*t; y = 1/2*g*t^2. y and h are usually the Same.

h=1/2*g*t^2. t^2 = (2*h) : g. t=√ (2*h) : g

v=x/√ (2*h) : g