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URGENT!! DAU COROANA ​

URGENT DAU COROANA class=

Răspuns :

Greutatea: G=m×g=80×10=800N

Normala: N=G=800N

Forta frecare: Ff=miu×N=0.2×800=160N

Forta F trage corpul cu viteza constanta.

F=Ff=160N

L=F×d=160×12=1920J