Question

qual a energia cinetica de uma particula de massa 5000g cuja a velocidade vale 72km/h passo a passo

Answer 1

72 Km/k = 20 m/s
5000g = 5 Kg

Ec = mv²/2
Ec = 5*20²/2
Ec = 5*200
Ec = 1000 J

Answer 2

$\sf m=5000\,g$

$\sf m=5\,kg$

$\sf v=72\,km/h$

$\sf v=20\,m/s$

$\sf E_c=\dfrac{1}{2}\cdot m\cdot v^2$

$\sf E_c=\dfrac{1}{2}\cdot5\cdot20^2$

$\sf E_c=2{,}5\cdot400$

$\boxed{\boxed{\sf E_c=1000\,J}}$