Three blocks are sliding together to the right along a surface of negligible friction when a force with magnitude Fext is exerted to the left on the rightmost block, as shown in the figure. The masses of the blocks are indicated in the figure. If the force is exerted for a time Δt , what is the change in velocity of the center of mass of the three-block system?
A Fext/6mΔt
B Fext/2mΔt
C 2Fext/mΔt
D 6Fext/mΔt
Answers: 3
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