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s= 90
t= 10 s
s= vo.t + 1/2 at²
90= 4.10 + 1/2.a.10²
90-40= 1/2a 100
50.2= 100 a
100/100= a
a= 1 m/s²
maka a( percepatan ) = 1 m/s²
maaf kalau ada yg salah.