Question

Three blocks of mass $1kg,4kg$ and $2kg$ are placed on a smooth horizontal plane as shown in figure. Find the acceleration of the system, in $m{s}^{-2}$?

• A. $10$
• B. $5$
• C. $12$
• D. $7$

Answer 1

The correct option is A $10$

Net force $=70N$ towards right.
Net mass of system $=7kg$.
Thus net acceleration $=\frac{force}{mass}=10m/s^2$