Question

Calcule a energia cinética de uma bola de massa 2,0 kg ao ser arremessada e atingir uma velocidade de 10 m/s.

Answer 1

Sabemos que:

$m = 2,0kg\\v = 10m/s$

Aplicando em Energia Cinética:

$E_c = \dfrac{mv^2}{2}\\E_c = \dfrac{2 \cdot 10^2}{2}\\E_c = 10^2\\\boxed{E_c = 100J}$

Answer 2

$\Large\displaystyle\text{ \begin{gathered} \hookrightarrow\boxed{\boxed{\bf{ E_c= 100~J }}} \end{gathered} }$

• Explicação:

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

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{2,0 \cdot10 {}^{2} }{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{2,0 \cdot100}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{200}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{E_c =100 \: J }}} \end{gathered} }$