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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A:

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A: The given values are,

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Q: 13. A rifle bullet with mass 8.00 g strikes and embeds itself in a block with a mass of 0.992 kg…

A: Given,

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