5) s1=at²/2=0,4×20²/2=80м
v=at=0,4×20=8 м/с
s2=vt+at²/2=8+0,2=8,2м
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5) s1=at²/2=0,4×20²/2=80м
v=at=0,4×20=8 м/с
s2=vt+at²/2=8+0,2=8,2м