An 85-kg lumberjack stands at one end of a 380-kg oating

Chapter 9, Problem 26

(choose chapter or problem)

An 85-kg lumberjack stands at one end of a 380-kg oating log, as shown in Figure 915. Both the log and the lumberjack are at rest initially. (a) If the lumberjack now trots toward the other end of the log with a speed of 2.7 m/s relative to the log, what is the lumberjacks speed relative to the shore? Ignore friction between the log and the water. (b) If the mass of the log had been greater, would the lumberjacks speed relative to the shore be greater than, less than, or the same as in part (a)? Explain. (c) Check your answer to part (b) by calculating the lumberjacks speed relative to the shore for the case of a 450-kg log.