Work Energy And Power Question 156
Question: A body of mass 2 kg moving with a velocity of 3 m/sec collides head on with a body of mass 1 kg moving in opposite direction with a velocity of 4 m/sec. After collision, two bodies stick together and move with a common velocity which in m/sec is equal to [NCERT 1984; MNR 1995, 98; UPSEAT 2000]
Options:
A) 1/4
B) 1/3
C) 2/3
D) ¾
Show Answer
Answer:
Correct Answer: C
Solution:
$ m_1v_1-m_2v_2=(m_1+m_2)v $
therefore $ 2\times 3-1\times 4=(2+1)\ v $
therefore $ v=\frac{2}{3}\ m/s $
