find total W.D by fricition assuming plank is sufficiently
Channel: Doubtnut
Date: 2021-11-10

find total W.D by fricition assuming plank is sufficiently long. img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/EAM_MEC_V01_C04_S01_041_Q01.png" width="80%"