A 0.75-kg block slides on a frictionless surface with a speed of 20 m/s. It then slides over a rough area 1.0 m in length and onto another frictionless surface. The coefficient of kinetic friction between the block and the rough surface is 0.17. What is the speed of the block
after it passes across the rough surface?
THINKING IT THROUGH. The task of finding the final speed implies that equations involving kinetic energy can be used, where the final kinetic energy can be found by using the conservation of total energy. Note that the initial and final energies are kinetic energies
since there is no change in gravitational potential energy. It is always good to make a sketch of the situation for clarity and understanding
(▼ Figure 5.24).

Transcribed Image Text:

E -x-1.0m- FIGURE 5.24 A nonconservative rough spot See Example 5.15 for description.