Question

um objeto de 3000g possui energia cinética de 600j

Answer 1

3000g=3kg

$Ec= \frac{m.v^{2} }{2}$
$v^{2} = \frac{2Ec}{m}= \frac{2*600}{3}=2*200=400$
$v= \sqrt{400}$
$v=20m/ s^{2}$

Answer 2

Olá,

3000 = 3kg

Ec = m.v²
        ____
           2

v² = 2*600/ 3 = 1200/3 = 400

v² = $\sqrt{400}$ = 20

R: 20 m/s²