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35² = 20² + 2.a.50
1225 = 400 + 100.a
1225 - 400 = 100.a
825 = 100.a
8,25 m/s² = a
Vt = Vo + a.t
35 = 20 + 8,25 . t
35 - 20 = 8,25 . t
15 = 8,25 . t
15 / 8,25 = t
1,81 s = t
Maaf kalau ada kesalahan
Vt = 35 m/s
S = 50 m
t __?
S. = (Vo + Vt)/2 t
50 = (20+35)/2 t
100 = 55 t
t = 100/55 = 1,8 s. <-- jawaban