Question

Calcule a energia cinética de uma bola de massa 0,12 kg ao ser arremessada e atingir uma velocidade de 34 m/s.

Answer 1

$Dados:\begin{cases} & \text Massa:0,12 kg \\ & \text Velocidade= 34\ m/s\end{cases}$

$Ec=\frac{m.v^{2}}{2} \\\\Ec=\frac{0,12\ .\ 34^{2}}{2} \\\\Ec=\frac{0,12\ .\ 1156}{2} \\\\Ec=\frac{138,7}{2} \\\\Ec=69,36\\\\:)$

Answer 2

$\Large\displaystyle\text{ \begin{gathered} \hookrightarrow\boxed{\boxed{\bf{ E_c= 69,36~J }}} \end{gathered} }$

• Explicação:

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

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{0,12 \cdot34 {}^{2} }{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{0,12 \cdot1156}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{138,72}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{E_c =69,36 \: J }}} \end{gathered} }$