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s = 15 m
Vo = 12 m/s
Vt = 0 m/s
Vt^2 = Vo^2 - 2as
0 = 12^2 - 2 . a . 15
0 = 144 - 30a
30a = 144
a = 144 : 30
a = 4,8 m/s2
F = m . a
F = 2000 . 4,8
F = 9600 N