First calculate the acceleration using the formula:
d = v0 t + 0.5 a t^2
where d is distance = 200 m, v0 = initial velocity = 0, t is time = 9s, a = acceleration (?)
200 = 0 + 0.5 * a * 9^2
a = 4.94 m/s^2
Force is mass times acceleration, therefore:
F = m a = 1200 kg * 4.94 m/s^2
F = 5,925.93 N