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A solid sphere a hollow sphere and a dis...

A solid sphere a hollow sphere and a disc all having same mass and radius, are placed at the top of a moth incline and released. Least time will be taken in reaching the bottom by

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On a smooth incline, the only accelerating force is mg sin`theta` acting at the CM.`N=mg cos theta` `mgsintheta=mA_(CM)rArrA_(CM)=gsintheta` `tau_(CM)=0rArralpha=0` Hence all the bodies will slip down with same acceleration and no spin.t=same for all `=sqrt((2l)/A_(CM))=sqrt((2l)/(g sin theta)` where l =length of the incline . `rArr`D is correct.
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