A sled and its rider are moving at a speed of 4.0 m/s along a horizontal stretch of snow, as Figure 4.25a illustrates.

A sled and its rider are moving at a speed of 4.0 m/s along a horizontal stretch of snow, as Figure 4.25a illustrates. The snow exerts a kinetic frictional force on the runners of the sled, so the sled slows down and eventually comes to a stop. The coefficient of kinetic friction is 0.050. What is the displacement x of the sled?