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s1=40m
s2= 20m
vo = 0 m/s
a = g = 10 m/s²
dit : t
Δs =40 - 20 = 20 m/s
vt² = vo + 2as
vt² = 0 + 2(10·20)
vt = √400 = 20m/s
vt = vo + at
20 = 0 + 10·t
t = 2 s
#yang ditebalin rumus
maaf jika ada kekurangan
= 20 m
s = v₀.t + (1/2).gt²
20 = 0 + 5t²
t² = 4
t = √4
t = 2 s atau t = -2 s ← ambil yang positif
maka t = 2 s