BY D EQU T=2pI  l/g

AS WELL AS WATER DROP D CENTER OF SYSTEM ( BOB + WATER) MOVE 2WARD DOUNWARD AS ITS RESULT EFFECTIVE LENTH OF SYSTEM INCRESE THEN (T) OF INCRESE

AFTER SUFFECIENT TIME D CENTER OF SYSTEM WILL MOVE 2WARD UP THEN EFFECTIVE LENGHT OF SYSTEM WILL DECRESE THEN (T) OF SYSTEM DECRESE

 

IF U SATYSFIDE THEN VOTE 4 ME       THK...........