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t = 6 s
s = 72 m
Vo = 0 m/s
F = ?
F = m * a
s = a* t² /2
2s = a*t²
a = 2s / t²
a = 2 * 72 m / (6 s )²
a = 4 m/s²
F = 20 kg * 4 m/s²
F = 80 N