Question

Calcule a energia cinética de uma pedra de massa 2ks ao ser arremessada e atingiu uma velocidade de 20m/s.

Answer 1

Resposta:

Ec=m.v^2/2

Ec=2.(20)^2/2

Ec=2.400/2

Ec=400J

Answer 2

$\Large\displaystyle\text{ \begin{gathered} \hookrightarrow\boxed{\boxed{\bf{ E_C= 400~J }}} \end{gathered} }$

• Explicação:

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

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

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{\not2\cdot400}{\not2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{E_C =400 \: J }}} \end{gathered} }$