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cari percepatan.
dimana sigma F = sigma m × a
jadi a = sigma F / sigma m.
sigma F = 20 - k (massa a) g
sigma F = 20 - 0,25 × 30 = 12,5N
dan sigma m = 2+3 = 5 kg
jadi a = 12,5/5 = 2,5 m/s^2
s= 1/2 at^2 . s=0.4m
t= √( 0,8 ÷ 2,5) =√0.32 s
jadi v = at = 2,5√0.32 = 1,41 m/s