m = 18.6 kg, g = 9.8 m/s2
m g sin 13.8 = F * cos (38.4 - 13.8)
F = (m g sin 13.8) / (cos (38.4 - 13.8))
= (18.6 * 9.8 * sin 13.8) / (cos (38.4 - 13.8))
smallest force = 47.8 N
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