Hi all, A friend and myself have constructed a very basic potato cannon and we are now looking to find the initial velocity of the potato as it leaves the barrel. I was wondering if there is a formula with which we can calculate this speed. We have found that flight time is the only ‘easy’ variable to measure, although I am sure there are others that we have not thought of yet. For safety reasons we only fire the projectile vertically. We came across a very simplified formula which was V = g t Where v = initial velocity, g = speed of gravity, t = time taken for the flight of the projectile – from when it leaves the barrel to when it hits the groundI realise that this discounts the effect of air resistance, but is this correct? Or can anyone point me towards a better formula to use. We are both in the equivalent of US Grade 10 so our knowledge of this area of mechanics/physics is limited. Thanks.