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g = 4 m/s
s = 10 m
a = 4/ 10 = 0, 4
F = ma
F = 50 kg kali 0, 4
F = 20 N
W= 1/2mv²
F.s = 1/2 mv²
F = 1/2mv² / s
= mv²/2s
= 50. 4² / 2.10
= 50.16 / 20
= 40 N