Question

Informe a velocidade adquirida por um objeto de 10 kg com uma energia cinetica de 1000J

Answer 1

Dada a formula da energia cinética:

$\mathsf{Ec=\dfrac{mv^2}{2}}$

Logo:

$\mathsf{1000=\dfrac{10v^2}{2}}\\\\\mathsf{2\cdot 1000=10v^2}\\\\\mathsf{v^2=\dfrac{2\cdot 1000}{10}}\\\\\mathsf{v^2=2\cdot 100}\\\\\mathsf{v=\sqrt{2\cdot 100}}\\\\\mathsf{v=10\sqrt{2}}\\\\\mathsf{v\approx 10\cdot 1,41}\\\\\boxed{\mathsf{v\approx 14,1\:m/s}}\: \: \checkmark$