alleryA 10 kg block on rough horizontal surface with μ_s = 0.3 just starts moving. Force applied:
A10 N
B20 N
C30 N
D100 N
Answer & Solution
Correct answer: C. 30 N
At critical force = limiting friction f_max = μ_s N = μ_s mg = 0.3 × 10 × 10 = 30 N. (Using g = 10 m/s².)
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