“Integration is zero for a point of homogeneous body' which is that point ? 

Define mechanical advantage in lever. 

A uniform solid cylinder of mass $M$ and radius $R$ rotates about a frictionless horizontal axle. Two similar masses suspended with the help two ropes wrapped around the cylinder. If the system is released from rest then the acceleration of each mass will be

How can general body be obtained ?

Characteristic of rotational motion. 

A mass $M$ is supported by a mass less string would wound a uniform cylinder of mass $M$ and radius $R$. On releasing the mass from rest, it will fall with acceleration