ok just say you have these values: s=1.3m u=0ms v=? a=10 t=0.5099 Now these values represent the vertical part of a vector.. now to work out velocity it uses a formula, v=s/t, = 1.3/0.5099 = 2.55ms... which is incorrect.. . but using this formula.. v^2=u^2 + 2as Plug in all the values v= 5.1ms why does this occur? is the velocity formula (s/t) only used when an object is in linear motion??