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Rev

$\begingroup$ Pro is here!, And this answer should be accepted! (I still can't figure out somewhere, physic is too hard to me :( ) $\endgroup$
– Conifers
Commented Oct 23, 2019 at 4:56
$\begingroup$ This puzzle seems easier than the site's(but both are hard for me :(, I can't even write an equation...) due to need consider more about the ball's normal force pressured on the rod, and this puzzle key & broom fall separately. $\endgroup$
– Conifers
Commented Oct 23, 2019 at 5:15
$\begingroup$ Thanks for the proper answer xnor :). Angular acceleration is beyond my knowledge set. $\endgroup$
– AndyT
Commented Oct 23, 2019 at 13:35

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