A duck is swimming down a river and passes a slow moving log. If the duck is mov

Question

A duck is swimming down a river and passes a slow moving log. If the duck is moving 2.50 times faster than the log, but the log has 3.25 times the kinetic energy of the duck, what is the ratio of the log's mass to the duck's mass?

A duck is swimming down a river and passes a slow moving log. If the duck is moving 2.50 times faster than the log, but the log has 3.25 times the kinetic energy of the duck, what is the ratio of the log's mass to the duck's mass? Number If the log had a mass of 30.5 kg, and the duck was swimming at 1.00 m/s, what is the log's kinetic energy? Be sure to include units. Number Units

Explanation / Answer

a) 3.25*0.5*m_duck*2.5*2.5 = 0.5*m_log

=> m_log/m_duck = 3.25*2.5*2.5 = 20.31

b) KE = 0.5*30.5/(2.5^2) = 2.44 J Answer

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