A \( 20 \mathrm{~kg} \) block is initially at rest on a rough horizontal surface. A horizontal f...

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A \( 20 \mathrm{~kg} \) block is initially at rest on a rough horizontal surface. A horizontal force of \( 75 \mathrm{~N} \) is required to set the block in motion. After it is in motion, a horizontal force of \( 60 \mathrm{~N} \) 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) \( 0.60 \)
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