(a) What is her velocity relative to the surface of ice?  m/s (b) What is the velocity of the plank relative to the surface of ice?  m/s

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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A 45.0 kg girl is standing on a 155 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.39 m/s relative to the plank. (Let the direction the girl is moving in be positive. Indicate the direction with the sign of your answer.)

(a) What is her velocity relative to the surface of ice?
 m/s

(b) What is the velocity of the plank relative to the surface of ice?
 m/s
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