Question 789311
{{{d=v[f] t - (1/2) a t^2}}}
{{{(1/2) a t^2+d=v[f] t }}}
{{{(1/2) a t^2=v[f] t-d }}}
{{{a t^2=2(v[f] t-d) }}}
{{{a =2(v[f] t-d)/t^2 }}}