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Vt=20
s=100
t=?
Vt^2=Vo^2+2as
400=100+2*a*100
200a+100=400
200a=300
a=1.5 m/s^2
Vt=Vo+at
20=10+1.5*t
1.5t=10
t=10/1.5
t=6.67 sekon