Răspunsuri

2014-05-13T16:19:38+03:00
Ecuatia lui Galilei
v²=v₀²+2a(x-x₀), v₀=0, x₀=0,x=d⇒v²=2ad
a=v/t
v²=2v/txd⇒t=2d/v
v=72 km/h=72x1000 m/3600s=20 m/s
t=2x600/20=60 s
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