Physics
Which of the following events does not involve a change in angular momentum?
1. A spinning ice skater drawing in her arms to increase her rotational speed.
2. A child walking along the perimeter of a merrygoround as it rotates.
3. A child walking towards the center of a spinning merrygoround.
4. A ball rolling down a ramp without slipping.
5. A hockey puck sliding without friction on the surface of an icy pond.
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