Question

Calcule a energia cinética de uma pedra de massa 0,3 kg e arremessada com velocidade de 30 m/ s

Answer 1

Olá !


Calculando a energia cinética ...


$\mathsf{E_{C}=\dfrac{MV^{2}}{2}} \\\\\\ \mathsf{E_{C}=\dfrac{0,3\cdot30^{2}}{2}} \\\\\\ \mathsf{E_{C}=\dfrac{0,3\cdot900}{2}} \\\\\\ \mathsf{E_{C}=\dfrac{270}{2}} \\\\\\ \boxed{\mathsf{E_{C}=135~~J}}$


$\textbf{RESPOSTA~~:}$ 135 Joules.