The “push”, or for a ship “the thrust”, as expressed in newtons is simply the mass of the ship laden in kilograms multiplied by the acceleration of the ship in meters per second per second. For the acceleration, we will assume that the ship will go from 0 to 12.0 knots in 1 hour and therefore will be subject to an acceleration of 0.00171 meters per second per second or m/s2 ((12*1852)/(3600*3600)= 0.00171 m/s2) . We can therefore calculate that for that ship to go from 0 to 12 knots in 1 hour the thrust that needs to be applied is a rather small thrust of only 311,220 newtons.