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History Bookmarks Window Help saplinglearning.com Summert. Find The Kinetic Energy Of Tho Objocts In The Fol.. Google Translate 7/14/2017 10:00 PM 0567/1007/11/2017 02:22 PM Gradebook Print Calculator sel Periodic Table Question 10 of 20 Sapling Learning MapA A duck is swimming down a river and passes a slow og. If the duck is moving 2.00 times faster than the log, but the log has 1.25 times the kinetic energy ot the duck, what is the ratio of the log's mass to the duck's mass? Number If the log had a mass of 10.0 kg, and the duck was swimming at 1.80 m/s, what is the log's kinetic energy? Be sure to include units. Units

Explanation / Answer

kinetic energy is given by:

KE = 0.5*m*V^2

given that

Vd = Velocity of duck

VL = velocity of log

Vd = 2*VL

KEL = 1.25*KEd

0.5*mL*VL^2 = 1.25*0.5*md*Vd^2

0.5*mL*VL^2 = 1.25*0.5*md*(2*VL)^2

mL/md = 1.25*4

mL/md = 5

B.

mL = 10 kg

Vd = 1.80 m/sec

VL = Vd/2 = 0.9 m/sec

KEL = 0.5*mL*VL^2

KEL = 0.5*10*0.9^2

KEL = 4.05 J

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