15. A 1.0 kg ball is tied to the end of a 2.5 m string to form a pendulum. The pendulum is released from rest with the rope extended horizontally. At the lowest point of the trajectory when the ball is moving horizontally, it elastically collides with a 2.0 kg block initially at rest on a horizontal frictionless surface. What is the speed of the block just after the collision? choose an answer A B C D E 2.3 m/s

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Q: A block of mass m = 3.9 kg slides on a horizontal rough surface head on into a spring of spring…

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