Răspunsuri

2014-05-19T16:16:42+03:00
L=Fxd
F-Ff=ma
F=ma+Ff
deoarece viteza variaza inseamna ca se executa o miscare uniform variata
din  ecuatia lui Galilei se afla acceleratia
v₂²=v₁²+2ad⇒v₂²-v₁²=2ad⇒a=(v₂²-v₁²)/2d
L=Fxd=[m(v₂²-v₁²)/2d+Ff]xd=15 J

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