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93. Kinetic friction is the | |
A. | tangent of angle between normal reac-tion and the resultant of normal reac-tion and the limiting friction [Wrong Answer] |
B. | ratio of limiting friction and normal reaction [Wrong Answer] |
C. | the friction force acting when the body is just about to move [Wrong Answer] |
D. | the friction force acting when the body is in motion [Correct Answer] |
E. | dynamic friction. [Wrong Answer] |