[tex]P= \frac{L}{t} = \frac{F * d}{t}= F*\frac{d}{t} = F * v [/tex]
Conditia de echilibru de translatie: R = 0
OX: F = Ff
[tex] F_{f} = F =\ \textgreater \ P = F_{f} * v\\
v = 72 \frac{km}{h} = 72 * \frac{1000m}{3600s} = 72 * \frac{10}{36} m/s = 20 m/s
\\ F_{f} = 2kN = 2000N
\\ =\ \textgreater \ P = F_{f} * v = 2000 * 20 = 40000J[/tex]
