Question

4- Uma carro de massa 120Kg movimenta-se com velocidade de 20m/s. Calcule a sua Energia Cinética.​

Answer 1

Ec= (mv²)/2 —> Ec= (120 . 20²)/2 —>
Ec= (120 . 400)/2 —> Ec= 48 000/2
Ec= 24.000 j

Answer 2

$\Large\displaystyle\text{ \begin{gathered} \hookrightarrow\boxed{\boxed{\bf{ E_C= 24000~J }}} \end{gathered} }$

• Explicação:

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{m \cdot{v} {}^{2} }{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{120 \cdot20 {}^{2} }{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{120\cdot400}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{48000}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{E_C =24000 \: J }}} \end{gathered} }$