Q 11-04-048NEETJEE MainMedium
A $4$ kg block on a rough horizontal table ($\mu_k = 0.25$) is connected by a light string over a smooth pulley at the table's edge to a $2$ kg block hanging freely. The acceleration of the system is ($g = 10\ \text{m/s}^2$)
Answer: (A) $\dfrac{5}{3}\ \text{m/s}^2$
Driving force: weight of the hanging block $= 20$ N. Friction on the table block $= 0.25 \times 40 = 10$ N.
$$a = \frac{20 - 10}{4 + 2} = \frac{5}{3}\ \text{m/s}^2$$
Solution by Sreeraj P, M.Sc Physics