Question

A 20 kg block is initially at rest. a 75 N force is required to set the block in motion. after the motion a force of 60 N is applied to keep the block moving with constant speed. the coefficient of static friction

• A. $0.6$
• B. $0.52$
• C. $0.44$
• D. $0.37$

Answer 1

Answer: (D)

$0.37$

As $75N$ force is required to set the block in motion that means maximum value of static friction is
$75N$

So, ${\mu }_{s}mg=75$

${\mu }_s=0.37$