Question

Calcule a energia cinética de uma bola de massa 6 kg ao ser arremessada e atingir uma velocidade de 3 m/s. *
1 ponto
a) 54J
b) 27J
c) 18 J
d) 36 J
e) o J​

Answer 1

Resposta: B)

Ec = m . v2 / 2

Ec = 6 . (3 . 3) / 2

Ec = 6 . 9 / 2

Ec = 54 / 2

Ec = 27 J

Answer 2

$\Large\displaystyle\text{ \begin{gathered} \hookrightarrow\boxed{\boxed{\bf{ E_C= 27~J }}} \end{gathered} }$

• Explicação:

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

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{6 \cdot3 {}^{2} }{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{6 \cdot9}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{54}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{E_C =27 \: J }}} \end{gathered} }$