Question: Top view of platform A freely-rotating merry-go-round has a child stan

Question

Question: Top view of platform A freely-rotating merry-go-round has a child standing at the center of the platform. As the child walks toward the outer edge of the platform, which statement is truc? a. Angular momentum increases and rotational kinetic energy increases b. Angular momentum decreases and rotational kinetic energy decreases. c. Angular momentum stays constant and rotational kinetic energy stays constant. d. Angular momentum stays constant and rotational kinetic energy increases. e. Angular momentum stays constant and rotational kinetic energy decreases C2009, Richard White. LearnAPphysics.com

Explanation / Answer

angular momentum is conserved so inertia will increase and angular velocity will decrease hence kinetic energy decreases with angular velocity


e. Angular momentum stays constant and rotational kinetic energy decreases

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