Question

Two masses $m_1 = 5$ kg and $m_2 = 4.8$ kg tied to a string are hanging over a light frictionless pulley. What is the acceleration of the masses when lift free to move? $(g = 9.8 m/s^2)$

• A. $0.2\, m/s^2$
• B. $9.8\, m/s^2$
• C. $5\, m/s^2$
• D. $4.8\, m/s^2$

Answer 1

Answer: (A)

$0.2\, m/s^2$

Answer 2

$a = \left(\frac{m_{1}-m_{2}}{m_{1}+m_{2}}\right) g = 0.2\,m/ s^{2}$