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nomor 1
vt = vo + at
10 = 5 + a.10
5 = 10a
maka, a = 5/10 = 1/2 m/s²
nomor.3
vt = vo + at
25 = 5 + 1/2t
20 = 1/2t
t = 40 s
maka, x = 40 s