Question

Qual o valor da energia cinética de uma pedra
de massa 200g ao ser arremessada e atingir
uma velocidade de 4 m/s?
​

Answer 1

Ec=mv²/2

Ec= 0,2*4²/2

Ec= 0,2*16/2

Ec= 3,2/2

Ec= 1,6J

Espero ter ajudado :)

Answer 2

$\Large\displaystyle\text{ \begin{gathered} \hookrightarrow\boxed{\boxed{\bf{ E_C= 1,6~J }}} \end{gathered} }$

• Explicação:

200g=0,2kg

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

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{0,2 \cdot4 {}^{2} }{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{0,2\cdot16}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{E_C = \dfrac{3,2}{2} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \boxed{\boxed{\sf{E_C =1,6 \: J }}} \end{gathered} }$