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You run a race with your friend. At first you each have the same kinetic energy, but then you find that she is beating you. When you increase your speed by 23%, you are running at the same speed she is. If your mass is 84 kg, what is her mass

Respuesta :

opudodennis

Answer:

53.54 Kg

Explanation:

We know that kinetic energy is given by [tex]0.5mv^{2}[\tex] where m is mass and v is the speed.

Let your speed be v and the speed of the friend will be 1.23v

Since kinetic energy is the same then

[tex]0.5\times84v^{2}=0.5m_u(1.23)^{2}\\\m_u=53.54 Kg[/tex]

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