A dumbbell constructed by affixing small identical balls

Last updated: 6/7/2023

A dumbbell constructed by affixing small identical balls each of mass m at the ends of a light rod of length 1 stands vertically on a frictionless floor touching a frictionless wall as shown in the figure If the lower ball is gently pushed away from the wall the dumbbell begins to slide Denoting acceleration due to gravity by g Mark the CORRECT statements A The maximum speed of the lower ball is attained when upper ball looses contact B The maximum speed of the lower ball is attained when tension in the light rod is zero C The maximum speed of the lower ball is tg 8gl V 27 D The speed of the upper ball when lower ball acquires maximum speed is 10gl