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200 = 800 x a
a = 200/800
a = 1/4m/s²
vt = vo - at
0 = 40 + 1/4t
40 = 1/4 t
t= 160 s
m = 800 kg
Vt = 40 m/s
Ditanya = t..?
Jawab
Cari percepatanyya dlu
F = ma
a = F/m
a = 200/800
a = 0,25 m/s²
Vt - Vo = at
40 - 0 = 0,25 x t
t = 40/0,25
t = 160 s