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v₀=40km/h=40000m/3600s=100/9m/s
v=100/9m/s+2m/s²×4s
v=100/9m/s+8m/s
v≈19,1m/s
E=mv²/2 -energia kinetyczna
E/E₀=mv²/2:mv₀²/2
E/E₀=v²:v₀²
E/E₀≈3
E=3E₀ -wzrośnie 3 razy