QUESTION

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At the county fair, Chris throws a $0.15 \mathrm{~kg}$ baseball at a $2.4 \mathrm{~kg}$ wooden milk bottle, hoping to knock it off its stand and win a prize. The ball bounces straight back at $10 \%$ of its incoming speed, knocking the bottle straight forward.


Part A What is the bottle's speed, as a percentage of the ball's incoming speed? Express your answer using two significant figures.

Problem 9.75 A $2.5 \mathrm{~kg}$, 20-cm-diameter turntable rotates at $100 \mathrm{rpm}$ on frictionless bearings. Two $200 \mathrm{~g}$ blocks fall from above, hit the turntable simultaneously at opposite ends of a diagonal, and stick.

Part A What is the turntable's angular velocity, in rpm, just after this event? Express your answer using two significant figures.

Public Answer

J5SPNT The First Answerer