Laws Of Motion Question 154
Question: Two masses 2 kg and 3 kg are attached to the end of the string passed over a pulley fixed at the top. The tension and acceleration are
Options:
A) $ \frac{7g}{8};\frac{g}{8} $
B) $ \frac{21g}{8};\frac{g}{8} $
C) $ \frac{21g}{8};\frac{g}{5} $
D) $ \frac{12g}{5};\frac{g}{5} $
Show Answer
Answer:
Correct Answer: D
Solution:
$ T=\frac{2m _{1}m _{2}}{m _{1}+m _{2}}g=\frac{2\times 2\times 3}{2+3}g=\frac{12}{5}g $
$ a=( \frac{m _{2}-m _{1}}{m _{1}+m _{2}} )\ g=( \frac{3-2}{3+2} )\ g=\frac{g}{5} $
