An 80 kg student stand, on the left end of a 240-kg log which is floating in the

Question

An 80 kg student stand, on the left end of a 240-kg log which is floating in the water (which you may treat as a frictionless surface). The student and the log are both initially at rest. a. Which point is the approximate center of mass of the student-log system? b. The student walks to the far end of the log at a constant speed of 2 m/s. As the student walks to the right, describe the velocity of the log. Provide quantitative values wherever possible. c. What is the velocity of the center of mass of the student-log system while the student is walking? Explain your answer.

Explanation / Answer

a )

at point " B " the total approximate center of mass of the system.

b )

here in this case log moves a speed of 0.671 m/sec as when the student moves the right

c )

the velocity of CM of student log system is ZERO m/sec

and

when student is walking with the initial velocity of CM of the system is also ZERO and there are no external fields are applied.

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