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A sphere is released on a smooth inclined plane from the top. When it moves down its angular momentum is:

1. conserved about every point
2. conserved about the point of contact only
3. conserved about the centre of the sphere only
4. conserved about any point on a fixed line parallel to the inclined plane and passing through the centre of the ball.

Correct answer: conserved about any point on a fixed line parallel to the inclined plane and passing through the centre of the ball.

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