Question

Um objeto de massa de 1000g possui energia cinética de 0,45kj. Dertemine a velocidade desse objeto em m/s

Answer 1

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

$\Large\displaystyle\begin{gathered}\tt E_c=0,45kj\implies E_c=450j\end{gathered}$

$\Large\displaystyle\begin{gathered}\tt m=1000g\implies m=1kg\end{gathered}$

$\Large\displaystyle\begin{gathered}\tt 450=\frac{v^2}{2} \end{gathered}$

$\Large\displaystyle\begin{gathered}\tt v^2 =900\end{gathered}$

$\Large\displaystyle\begin{gathered}\boxed{\tt v =30\ m/s}\end{gathered}$