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Angular momentum calculations

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A 0.10kg ball is thrown with a speed of v=2.0ms at a resting stick that can rotate around one end at axis O. The ball hits the stick at r=1.5m from O as shown below.
What is the angular momentum of the ball about axis O before hitting the stick?
Answer using a coordinate system where counterclockwise is positive.
Round answer to two significant digits.
  • Your answer should be
  • an exact decimal, like 0.75