Solved 6. A ping-pong ball is tied to a string at the bottom | Chegg.com
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Table Tennis Net Replacement Ping Pong Net String Tension PE, Blue Green 2pcs 734301839334 | eBay
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Ping Pong Paddle String Ball Attached | Racket Short Handle Long Ping Pong Paddle - Table Tennis Rackets - Aliexpress
A ping-pong ball has a mass of 2.0 gm and an external volume of 24 cm^3. It is connected with a fine string to the end of a glass jar, as shown,
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Strings And Things | Shawn Lee's Ping Pong Orchestra | Shawn Lee