ch07-p005 - 5. We denote the mass of the father as m and...

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5. We denote the mass of the father as m and his initial speed v i . The initial kinetic energy of the father is KK i = 1 2 son and his final kinetic energy (when his speed is v f = v i + 1.0 m/s) is f = son . We use these relations along with Eq. 7-1 in our solution. (a) We see from the above that if = 1 2 which (with SI units understood) leads to () 2 2 11 1 1.0 m/s 22 2 ii mv m v ªº =+ «» ¬¼ . The mass cancels and we find a second-degree equation for
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