[latex] V_1 = 36 frac{km}{h } = frac{36 *1000 m }{3600 s } = 10 frac{m}{s} E_k_1 = 40kJ = 40000 J V_2 = 108 frac{km}{h} = frac{108 *1000 m }{3600 s } = 30 m/s E_k_2 = ? obl. mase ciala: Ek_1 = mV_1^2/2 2E_K_1 = mV_1^2 m =2E_k_1/V_1^2 m = 2 *40000 J /(10 m/s)^2 m = 800 kg Ek_2 = frac{m* V_2^2}{2} E_k_2 = frac{800 kg * (30 m/s)^2}{2} E_k_2 = 360000 J = 360kJ [/latex]
[latex] V_1 = 36 frac{km}{h } = frac{36 *1000 m }{3600 s } = 10 frac{m}{s} E_k_1 = 40kJ = 40000 J V_2 = 108 frac{km}{h} = frac{108 *1000 m }{3600 s } = 30 m/s E_k_2 = ? obl. mase ciala: Ek_1 = mV_1^2/2 2E_K_1 = mV_1^2 m =2E_k_1/V_1^2 m = 2 *40000 J /(10 m/s)^2 m = 800 kg Ek_2 = frac{m* V_2^2}{2} E_k_2 = frac{800 kg * (30 m/s)^2}{2} E_k_2 = 360000 J = 360kJ [/latex]