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

A 10 kg block is initially at rest on a rough horizontal surface. A horizontal force of 60 N is required to set the block in motion . After it is in motion , a horizontal force of 50 N is required to keep the block moving with constant velocity . The ratio coefficient of static and kinetic friction is

A20 kg block is initally at rest. A 75 N force is required to set the block in motion. After the motion starts, a force of 60 N is required to keep the block moving with constant speed. The coefficient of static friction is

A20 kg block is initally at rest. A 75 N force is required to set the block in motion. After the motion starts, a force of 60 N is required to keep the block moving with constant speed. The coefficient of static friction is

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

A body of mass 25 kg is at rest on a horizontal surface. Minimum horizontal force required to just start motion is 73.5N and a force of 49N is needed to keep the body moving with a constant velocity. What is the coefficient of (i) static friction and (ii) kinetic friction ?

A block of mass 5 kg rests on a rough horizontal surface. It is found that a force of 10 N is required to make the block just move However , once the motion begains, a force of only 8 N is enough to maintain the motion find the coefficient of kinetic and static friction between the block and the horizontal surface