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 = M.V²/2

Ec = 200.4²/2

Ec = 1600J

Answer 2

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

• Explicação:

200g=0,2kg

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

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

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

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

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