Question

qual a energia cinetica de um caminhão de 20 kg á 108 km/h ?

Answer 1

108km/h=30m/s

Ec=mv^2/2
Ec=20•30^2/2
Ec=20•900/2
Ec=18000/2
Ec=9000 J

Answer 2

$\mathsf{Ec=\frac{ m.v^{2}}{2} }$

$\mathsf{Ec= \frac{20.30^{2}}{2} }$

$\mathsf{Ec = \frac{18000}{2} }$

$\mathsf{Ec = 9000 J}$