Work Energy And Power Question 121
Question: A body of mass 2kg makes an elastic collision with another body at rest and continues to move in the original direction with one fourth of its original speed. The mass of the second body which collides with the first body is [Kerala PET 2002]
Options:
A) 2 kg
B) 1.2 kg
C) 3 kg
D) 1.5 kg
Show Answer
Answer:
Correct Answer: B
Solution:
$ m_1=2kg $ and $ v_1=( \frac{m_1-m_2}{m_1+m_2} )u_1 $
$ =\frac{u_1}{4} $ (given) By solving we get $ m_2=1.2kg $
