at 32 Acceleration is 32 mss downward it is a constant acceleration . It is convention to use negative as downward , although if you interpret the answer correctly it doesn ' t really matter . Nevertheless , stick with convention because everyone else will use it and it will help you when working with others . vt 32 tc via integrationAt this point you can ask yourself , what is that c ? It is your initial condition of the velocity . Your initial condition that it was dropped implies that v 0 0 , because at time t 0 , your stone isn ' t moving because you are holding it . So that implies c 0 . If the stone was thrown , your c would be different . Typically in physics , your velocity function will be described asvt atviwhere vi is your initial velocity . vi is supposed to be a v with subscript i