Question

A force of $10N$ is applied on the right block of a system of two blocks of $1kg$ mass each, on a rough horizontal plane. coefficient of friction is $\mu =0.2$ for both blocks. The spring is initially in relaxed state. Acceleration of centre of mass at initial instant will be $(g=10m/s^2)$

• A. $5m/s^2$
• B. $4m/s^2$
• C. $3m/s^2$
• D. $2m/s^2$

Answer 1

The correct option is B $4m/s^2$

$\begin{array}{c}accof1kgblock=\frac{10-2}{1}=8m/s^2\\ \therefore a_{com}=\frac{8\left(1\right)+1\left(0\right)}{2}=4m/s^2\end{array}$

Hence,

option $\left(B\right)$ is correct answer.