A pendulum of mass m and length l [ as in figure] is attached to the top of a pole of height also l. Initial conditions have been set up so that the mass swings around in a horizontal circle, with the string always making an anlge of `60^(@)` with the vertical, as shown. A frictionless hemispherical shell of radius l is now fixed in placed over the setup [as in figure (2)]. with the top of the shell attached to the top of the pole. If the speed of the mass is now arranged to be twice what it was in previous case then the normal force from the hemisphere on the mass is nmg, then n is

Answer

0

Explanation

At t = 2 sec block stops.
As impulse of friction + impulse of F = initial mom, impulse of friction is negative.