You fire your potato gun horizontally from shoulder height, which is 190 cm above the ground. The potato strikes the ground 30 m away from you. What was the initial speed of the potato?

Answer 1

h = 1.9 m.
Dx = 30 m.

h = 0.5g*t^2 = 1.9 m.
4.9t^2 = 1.9
t^2 = 0.388
Tf = 0.623 s. = Fall time.

Dx = Xo * Tf = 30
Xo * 0.623 = 30
Xo = 48.2 m/s. = Initial speed.