An 0.252 kg object is initially moving at 23.4 m/s [E] along the ice. The coefficient of kinetic friction for the object and the ice is 0.00500. a. What is the speed of the object after travelling 48.3 m?

b. Once the ice become rougher, the coefficient of kinetic friction increases to 0.0475. How far will the object travel if its initial and final speeds are the same as before?

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)