Masa 5 kg prędkość 20km/h oblicz kinetyczna

Ek= 1/2mv2 m=5kg v=20km/h = 20 * 1000/3600 (m/s) = 20 * 20000/3600 (m/s) = 5,56 (m/s) Ek=1/2*5*(5,56)2= 77,160 J

[latex]dane:\m = 5 kg\v = 20frac{km}{h} = 20*frac{1000m}{3600s} = frac{50}{9}frac{m}{s}\szukane:\E_{k} = ?[/latex] [latex]E_{k} = frac{mv^{2}}{2}\\E_{k} = frac{1}{2}*5kg*(frac{50}{9}frac{m}{s}) = frac{12500}{162} J\\E_{k} = 77,16 J[/latex]