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s= v.t
= 20.4
=80m
vt= vo+ at
0 = 20 + a.4
-20 = 4a
a = -5 m/s²
lalu mencari jarak
s= vo.t + ½at²
s = 20. 4 + ½. -5. 4²
s = 80 + ½. -5. 16
s = 80 -5. 8
s = 80 - 40
s = 40 m
semoga membantu. semangat belajar fisika :)