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Rotational motion. I need help with #9

9. For the system below, the
mass falls from rest a distance
of 1.5 meters in 0.90 seconds.
r= 0.5 m
a. What is the
acceleration of the
mass?
b. What is the
angular
acceleration of the
wheel?
c. Through what
angle does the
wheel spin in this
time?

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