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Question

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

A
0.30
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B
0.44
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C
0.52
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D
0.38
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Solution

The correct option is D 0.38
Coefficient of static friction μs=F1R=75mg=7520×9.8=0.38

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