Question

Value(s) of m for which system remains at rest (pulleys and strings are ideal) $[g=10m/s^2]:$

• A. $1kg$
• B. $2kg$
• C. $18kg$
• D. $20kg$

Answer 1

Answer: (B), (C)

$2kg$
$18kg$

$f_{max}=20\times 0.4\times 10=80N$
For equilibrium
minimum value of $m\Rightarrow m\left(10\right)=100-80\Rightarrow m=2kg$
maximum value of $m\Rightarrow m\left(10\right)=100+80\Rightarrow m=18kg$
So, (B) and (C) are correct.