A block of mass M with a semicircular track of radius R rests on a horizontal frictionless surface. A uniform cylinder of radius r and mass m is released from rest from the top point A. The cylinder slips on these semicircular frictionless tracks. The velocity of the block when the cylinder reaches point (B) is :
![294003_c61cd3f36716424baca1ab5e752d03bd.png](https://search-static.byjusweb.com/question-images/toppr_invalid/questions/294003_c61cd3f36716424baca1ab5e752d03bd.png)