A 20 kg block is initially at rest on a rough horizontal surface.  A horizontal force of 75 N is
Channel: Doubtnut
Date: 2020-08-23

A 20 kg block is initially at rest on a rough horizontal surface.  A horizontal force of 75 N is required to set the block in motion.  After it is in motion, a horizontal force of 60 N is required to keep the block moving with constant speed.  The coefficient of static friction is