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Per NCERT §4.9.1, the coefficients of static and kinetic friction satisfy which order?
Aμ_s = μ_k
Bμ_k > μ_s
Cμ_s = 0 always
Dμ_s > μ_k
Answer & Solution
Correct answer: D. μ_s > μ_k
NCERT §4.9.1: experimentally μ_k < μ_s. That is why a force just sufficient to set a body moving keeps it moving with acceleration.
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