Laws Of Motion Question 161

Question: A block A of mass 7 kg is placed on a frictionless table. A thread tied to it passes over a frictionless pulley and carries a body B of mass 3 kg at the other end. The acceleration of the system is (given g = 10$ m{{s}^{-2}}) $ [Kerala (Engg.) 2000]

Options:

A) $ 100m{{s}^{-2}} $

B) $ 3m{{s}^{-2}} $

C) $ 10m{{s}^{-2}} $

D) $ 30m{{s}^{-2}} $

Show Answer

Answer:

Correct Answer: B

Solution:

$ a=\frac{m _{2}}{m _{1}+m _{2}}g=\frac{3}{7+3}10=3m/s^{2} $



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