Folosim formula puterii mecanice.
P=[tex] \frac{L}{delta t} [/tex]⇒ Δt=[tex] \frac{L}{P} [/tex]=[tex] \frac{60 J}{1 W} [/tex]= 60 s
Calculam puterea mecanica cu noul lucru mecanic.
P'=[tex] \frac{600 J}{60 s} [/tex]= 10 W
ΔP= P'-P= 10 W - 1 W= 9 W
Motorul isi mareste puterea cu 9 W.