Hi, Quick Qustion : If an object is propelled through the air (e.g. a ball is thrown), once the ball has left the throwers hand it will immediatly start to have negative acceleration (at least in the x plane). If the negative acceleration is measured at the same point in time after the ball has left the throwers hand for each throw and all other variables being equal exept the velocity, is it possible to determine the initial velocity of the ball for each throw at the moment it left the throwers hand by using the measured negative acceleration only? If so, what method/formula is used to determine this? Many Thanks.