Question

Each of the three plates has a mass of 10 kg. If the coefficient of static and kinetic friction at each surface of contact are ${\mu }_s=0.3$ and ${\mu }_k=0.2$, respectively $(g=10m{s}^{-2})$The acceleration of block C is:

• A. zero
• B. $3.336m/s^2$
• C. $4m/s^2$
• D. $5m/s^2$

Answer 1

Answer: (C)

$4m/s^2$

We have the equation, $F=ma$

From the free body diagram,

$F=ma$

$⟹(100-60)=10\times a$

$a=\frac{100-60}{10}=4m{s}^{-2}$