Question

Calcule a energia cinética de uma bola de massa 1,2 kg ao ser arremessada e atingir uma velocidade de 30 m/s.

Answer 1

Resposta:

Ec = 540 J

Explicação:

m = 1,2 kg

v = 30 m/s

Ec = mv²/2

Ec = 1,2 . 30²/2

Ec = 540 J

Answer 2

$\Large\displaystyle\text{ \begin{gathered} \hookrightarrow\boxed{\boxed{\bf{ E_c= 540~J }}} \end{gathered} }$

• Explicação:

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

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{1,2\cdot30{}^{2} }{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{1,2 \cdot900}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_c = \dfrac{1080}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{E_c =540 \: J }}} \end{gathered} }$