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A ball with mass M, moving horizontally at 5.4 m/s, collides elastically with a block with...

A ball with mass M, moving horizontally at 5.4 m/s, collides elastically with a block with mass 2.8M that is initially hanging at rest from the ceiling on the end of a 46-cm wire. Find the maximum angle through which the block swings after it is hit, in degrees.

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