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va' = -5 m/s
t= 0,2 s
p = m.Δv
I = F.Δt
I=p
F.Δt = m.Δv --> Δv= va'-va
F. 0,2 = m. (-5- 10)
F .0,2 = -15 m
F= -15m /0,2
= -150m/2
= -75 m N