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v (final) = 0 m/s
d = 80cm = 0.8 m
v(final)² = v(inicial)² + 2(a)(d)
Despejando
a = [v(final)² - v(inicial)²] / 2d
a = [0 m/s - (25m/s)²] / 2 (0.8m)
a = -625 / (1.6) m/s²
a = -390.625 m/s²
F = ma
F = (800kg)(390.625 m/s²)
F = 312500 N