Question

hello
please help me

Answer 1

According to dimensional analysis, as we know the question asks about the length so the answer should have length as a dimension now in 1 and 2 option there is no length as a dimension so both are wrong now we move on to the 3 and 4 here we apply the normal mass and length variation using LAMDA as mass per unit length thus cancelling both the forces which are acting down and opposite to it due to force of friction so there would be a negative sign thus cancelling out the mass and leaving behind the answer as 4th one

Answer 2

heya user....☺️

⭐️ANSWER: option no. (d)

hope it helps!!!

#be brainly....✌️