Answer:
4000 N
Step-by-step explanation:
First we calculate the acceleration
2as = vf^2 - vi^2
2xax0.1 = 0^2-40^2
0.2 x a = -1600
a = - 8000 m/s^2
F= ma
F= 0.5 x 8000
F 4000N
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