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t = 10 s
vt = 20 m/s
pertama cari dulu percepatannya dengan t = 5s
a = Δv / t
a = 20 - 15 / 5 = 3 m/
sekarang cari jaraknya (t=10 s)
s = v0 + 1/2 x a x t^2
s = 5 + 1/2 x 3 x 10^2
s = 5 + 1/2 x 3 x 100
s = 5 + 50x3
s = 5 + 150 = 155 m