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70 = 20 + a x 10
70 - 20 = 10a
50 = a
a = 5 m/s²
F = m x a
F = 800 x 5
F = 4000 N
Vo = 20 m/s
Vt = 70 m/s
t = 10 s
Ditanya = F..?
Jawb
a = Vt - Vo / t
a = 70 - 20 / 10
a = 50/10
a = 5 m/s²
F = ma
F = 800 x 5
F = 4000 N