Question

HELP :(
A energia cinética é 2000J de um objeto de massa 20kg, qual sua velocidade? ​

Answer 1

$\Large\displaystyle\text{ \begin{gathered} \sf{ E_c=\frac{1}{2}\cdot m\cdot v^2} \end{gathered} }$

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

$\Large\displaystyle\text{ \begin{gathered} \sf{v=\sqrt{\frac{2\cdot2000}{20}} } \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{ v=\sqrt{\frac{4000}{20}}} \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{ v=\sqrt{200}} \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered} \sf{ v=2\cdot5\sqrt{2}} \end{gathered} }$

$\Large\displaystyle\text{ \begin{gathered}\boxed{\sf{v=10\sqrt{2}\,m/s}}\end{gathered} }$