Force is the rate of change of momentum.
Initial momentum = 1200 kg * 25 m/s = 30000 kg-m/s
final momentum = 1200 kg * 0 m/s = 0 kg-m/s
Force = rate of change of momentum
= (0-30000)/0.04 kg-m/s^2
=750,000 kg-m/s^2
=750 kN
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