Question

1. Calcule a energia cinética de uma bola de massa 1,2 kg ao ser arremessada e atingir uma velocidade de 5 m/s

Answer 1

Vamos calcular a Energia Cinética

$E_{c} =\frac{m.v^{2} }{2} \\E_{c}= \frac{1,2.5^{2} }{2} \\E_{c}=\frac{1,2.25}{2} \\E_{c}=\frac{30}{2} \\E_{c}=15J$

Answer 2

$\Large\displaystyle\text{ \begin{gathered} \hookrightarrow\boxed{\boxed{\bf{ E_c= 15~J }}} \end{gathered} }$

• Explicação:

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

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{1,2 \cdot5 {}^{2} }{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{1,2 \cdot25}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{30}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{E_c =15 \: J }}} \end{gathered} }$