A 25-kg block is dragged with a constant speed of 2 m/s along a horizontal surface with a force of 75- N that is directed horizontally.
(a) What is the coefficient of kinetic friction? This same block is now placed on an inclined plane, and the angle of the plane is increased until the block just begins to slip. This angle is measured to be 30 degree.
(b) What is the coefficient of static friction?
(c) If the block slides 8 m along the plane (still inclined at 30 degree), how much work is done by gravity?
(d) How much work is done by friction as the block slides the same 8 m?
(e) What is the speed of the block after sliding 8 m? After sliding 8 m down the incline the block encounters a level stretch with the same coefficient of kinetic friction as on the incline.
(f) How far does the block slide before coming to rest?