Use the kinematics equation (v = u + at)
Rearrange for initial velocity: (u = v – at)
Use the kinematics equation (s = ut + tfrac{1}{2}at^2)
Rearrange for initial velocity: (u = dfrac{s – tfrac{1}{2}at^2}{t})
Use the kinematics equation (v^2 = u^2 + 2as)
Rearrange for initial velocity: (u = pmsqrt{v^2 – 2as})
Use (u = dfrac{2s}{t} – v) when average velocity is needed
Use the appropriate known values: final velocity, acceleration, displacement, and time
Check units before substituting values
Choose the equation that matches the given information