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v = 600 m/s
m = 8kg
F = ?
a = v/t
S = ½*at² = ½vt => t = 2s/v
a = v/2s/v = v²/2s
a = F/m => F = m * a = m * v²/2s = 8 * 600²/4 = 8 * 90000 = 720000 N = 720kN