A 1 kilogram ball is attached to the end of a 25 meter, Ask an Expert

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A 1 kilogram ball is attached to the end of a 2.5 meter string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point in its swing when it is moving horizontally, the ball collides elastically with a 2.0 kilogram block initially at rest on horizontal frictionless surface. Find the speed of the block just after the collision?

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