Question

Calcule a energia cinética de uma bola de massa 20 kg ao ser arremessada e atingir uma velocidade de 5 m/s.​

Answer 1

Ec = m. v^2 / 2

Ec = 20. 5^2 / 2

Ec = 20. 25 / 2

Ec = 500 / 2

Ec = 250 J ✓

Answer 2

$\Large\displaystyle\text{ \begin{gathered} \hookrightarrow\boxed{\boxed{\bf{ E_c= 250~J }}} \end{gathered} }$

• Explicação:

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

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{20\cdot5 {}^{2} }{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{20 \cdot25}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{500}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{E_c =250 \: J }}} \end{gathered} }$