Question

03) Calcule a energia cinética de uma bola de massa 0,6 kg ao ser arremessada e atingir uma velocidade de 10 m/s.

a) 50 J

b) 30 J

c) 25 J

d) 60 J

e) 100 J

​

Answer 1

Resposta:

b

Explicação:

Ec = (m . v²)/2

Ec = (0,6 . 10²) /2

Ec = 30 J

Answer 2

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\bf{ E_C= 30~J }}} \end{gathered} }$

Portanto:

$\Large\displaystyle\text{ \begin{gathered}\boxed{\boxed{\bf Letra~B}}\end{gathered} }$

• Explicação:

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

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{0,6 \cdot10 {}^{2} }{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{0,6 \cdot100}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{60}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{E_C =30 \: J }}} \end{gathered} }$