Question

va rog ajuta ti ma urgent va dau coroana

Answer 1

$E_{c}=\frac{m \cdot v^{2}}{2}\\ \\m1=1000kg,<span>v1=\frac{72km}{h}=\frac{72000m}{3600s}=\frac{20m}{s}\\ </span>\\m2=5t=5000kg,<span>v2=\frac{36km}{h}=\frac{36000m}{3600s}=\frac{10m}{s}\\ </span>\\ \\ \\ E_{c1}=\frac{m1 \cdot v1^{2}}{2}=\frac{1000kg\cdot (\frac{20m}{s})^{2}}{2}=\\ \\ =500kg\cdot \frac{400m^{2}}{s^{2}}=200.000J\\ \\ \\ \\ E_{c2}=\frac{m2 \cdot v2^{2}}{2}=\frac{5.000kg\cdot (\frac{10m}{s})^{2}}{2}=\\ \\ =2.500kg\cdot \frac{100m^{2}}{s^{2}}=250.000J\\ \\ \\ \\ Deci,<span>E_{c2}>E_{c1}$