How to Shine a #Cricket Ball for #Swing and #Seam

On what factor does the inertia of a body depend ? Which has more inertia, a cricket ball or a rubber ball of the same size ?

Swingeing

It is easier to stop a tennis balll than a cricket ball moving with the same speed. Why?

A cricket fielder can throw the cricket ball with a speed v_(0) .If the throws the ball while running with speed u at an angle theta to the horizontal. The effective angle to the horizontal at which the ball is projected in air as seen by a spector is