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Vt=0
t=4skon
cari percepatanny dulu
Vt=Vo+at
0=80+ax4
0=80+4a
a= -20m/s
bru cri jrknya
s=Vot+1/2atkuadrat
s=80x4 + 1/2x-20x4
s=320-40
s=280 meter..
80= g.4
80/4=g
20=g
jarak
s= Vo+1/2.a.t^2
s=80+1/2.20.4^2
s= 80 + 160
s=240