A student initially stands on a circular platform that is free to rotate without friction about its center. The student jumps off tangentially, setting the platform spinning. Quantities that are conserved for the student-platform system as the student jumps include which of the following?
I. Angular momentum
II. Linear momentum
III. Kinetic energy
a. I only
b. II only
c. I and II only
d. II and III only
e. I, II, and III
Answers: 3
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