Question

URGENTE me ajudem por favor

Answer 1

Resposta:

Ec1 = m.v1²/2  =>  Ec1.2 = m.v1² => 2 Ec1/m = v1² => v1 = $\sqrt{\frac{2Ec1}{m} }$

0,9Ec1 = m.v2²/2 => 1,8 Ec1 = m. v2²=> 1,8 Ec1/m = v2² => v2 = $\sqrt{\frac{1,8Ec1}{m} }$

e = v2/v1 = $\sqrt{\frac{1,8Ec1}{m} } : \sqrt{\frac{2Ec1}{m} } = \frac{\sqrt{1,8Ec1} }{\sqrt{2Ec1} } = \frac{\sqrt{1,8} }{\sqrt{2} } . \frac{\sqrt{2} }{\sqrt{2} } = \frac{\sqrt{3,6} }{2} = \frac{0,6}{2} = 0,3$  

e= 0,3