A 20 kg block is initially at rest on a rough horizontal surface. A – McqOptions

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1.	A 20 kg block is initially at rest on a rough horizontal surface. A horizontal force of 75 N is required to set the block in motion. After it is in motion, a horizontal force of 60 N is required to keep the block moving with constant speed. The coefficient of static friction is [AMU 1999]
A.	0.38
B.	0.44
C.	0.52
D.	0.60
Answer» B. 0.44

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