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A 6 kg block moves with a constant speed 5 m/s on a horizontal frictionless surface and collides elastically with an identical block initially at rest. The second block collides and sticks to the last 6 kg block which was initially at rest.What is the speed of the second 6 kg block after the first collision?A. zeroB. 2 m/sC. 2.5 m/sD. 5 m/s
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