Q. Two masses of $4\ kg$ and $5\ kg$ are connected by a string passing through a frictionless pulley and are kept on a frictionless table as soon as shown in the figure. The acceleration of $5\ kg$ mass is
A) $49\ m/s^{2}$
B) $5.44\ m/s^{2}$
C) $19.5\ m/s^{2}$
D) $2.72\ m/s^{2}$
Explanation
(b) $a = \frac{m_{2}}{m_{1} + m_{2}} \times g = \frac{5}{4 + 5} \times 9.8 = \frac{49}{9} = 5.44\ m/s^{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.