Q. Two bodies of mass $3\ kg$ and $4\ kg$ are suspended at the ends of massless string passing over a frictionless pulley. The acceleration of the system is $(g = 9.8\ m/s^{2})$
A) $4.9\ m/s^{2}$
B) $2.45\ m/s^{2}$
C) $1.4\ m/s^{2}$
D) $9.5\ m/s^{2}$
Explanation
(c) Acceleration $= \frac{(m_{2} - m_{1})}{(m_{2} + m_{1})}g$
$= \frac{4 - 3}{4 + 3} \times 9.8 = \frac{9.8}{7} = 1.4\ m/\sec^{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.