A 90-kg lumberjack stands at one end of a 400-kg floating log, as shown in the...
A 90-kg lumberjack stands at one end of a 400-kg floating log, as shown in the following figure. Both the log and the lumberjack are at rest initially. The lumberjack then trots toward the shore with a speed of 2.7 m/s relative to the shore.
A) What is the speed of the log relative to the shore? Ignore friction between the log and the water.
B) If the mass of the log were greater, would its speed relative to the shore be greater than, less than, or the same as the speed found in part A?
C) Check your answer to part B by calculating the speed relative to the shore for a 470-kg log.
Homework Answers
Approach used:- here we use the momentum
conservation principle to find the speed, initially the momentum is
zero for the log+lumberjack system, so final momentum of system
would be zero too. We use this find the required speed as shown
below, 
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Check the answer and let me know immediately if you
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A 90-kg lumberjack stands at one end of a 400-kg floating log,
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