Question

Um objeto de 80g possui 36 j de energia cinética. Qual a velocidade desse objeto ?

Answer 1

$\boxed{E_{c}=\frac{m*v^2}{2}}$
$\boxed{36=\frac{0,08*v^2}{2}}$
$\boxed{36*2=0,08*v^2}$
$\boxed{72=0,08*v^2}$
$\boxed{v^2=\frac{72}{0,08}}$
$v^2=900$
$v=\sqrt{900}$
$\boxed{\boxed{Resposta:v=30m/s}}$

Answer 2

E=mv2/2 logo 36J = 0.08×v2/2
72j=0.08×v2
√900= v
v= 30m/s