Help Chapter 7 H.W. Begin Date: 1/8/2018 12:00:00 AM - Due Date: 3/4/2018 1159 0

Question

Help Chapter 7 H.W. Begin Date: 1/8/2018 12:00:00 AM - Due Date: 3/4/2018 1159 00 PM End Date: 3/5/2018 1200:00 AM (20%) Problem 5: Two objects are dropped from rest from height h. If object A is twice the mass of object B what can be said about their kinetic energies just as they hit the floor? Grade S Deducti Potentia object A has four times the kinetic energy of object B object A has twice the kinetic energy of object B object A has one fourth the kinetic energy of object B object A has half the kinetic energy of object B object A has the same kinetic energy of object B Submis Attemp detaile Submit Hint I give up Hints: 0 deduction per hint. Hints remaining Feedback:0 deduction per feedback

Explanation / Answer

both A and B reaches the ground with same speed v

v = sqrt(2*g*h)

kinetic energy is KE = 0.5*m*v^2

given that mA = 2*mB

then

kA/kB = mA/mB

kA/kB = (2*mB)/mB

kA/kB= 2

kA = 2*kB

so the answer is

object A has twice the kinetic energy of object B

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