Question

01) uma bola que possui massa m:0,5 kg movimenta-se com velocidade v: 80 m/s, calcule a energia cinética

Answer 1

A energia cinética está relacionado com o movimento do corpo, dada pela formula:

$\mathsf{Ec=\dfrac{mv^2}{2}}\\\\\\\mathsf{Ec=\dfrac{0,5\cdot 80^2}{2}}\\\\\\\mathsf{Ec=\dfrac{0,5\cdot 80\cdot 80}{2}}\\\\\\\mathsf{Ec=0,5\cdot 80\cdot 40}\\\\\\\mathsf{Ec=\dfrac{8\cdot 4\cdot 100}{2}}\\\\\\\mathsf{Ec=8\cdot 2\cdot 100}\\\\\\\mathsf{Ec=16\cdot 100}\\\\\\\boxed{\mathsf{Ec=1.600\:J\: \:ou\: \:1,6\:kJ}}\: \: \checkmark$

Answer 2

$E_{c} = \frac{m* v^{2} }{2}$

$E_{c} = \frac{0,5 * 80^{2}}{2}$

$E_{c} = \frac{3200}{2}$

$\boxed{ E_{c} = 1600J}$