Work Energy And Power Question 98
Question: A ball of mass 10 kg is moving with a velocity of 10 m/s. It strikes another ball of mass 5 kg which is moving in the same direction with a velocity of 4 m/s. If the collision is elastic, their velocities after the collision will be, respectively [CMEET Bihar 1995]
Options:
A) 6 m/s, 12 m/s
B) 12 m/s, 6 m/s
C) 12 m/s, 10 m/s
D) 12 m/s, 25 m/s
Show Answer
Answer:
Correct Answer: A
Solution:
$ v_1=( \frac{m_1-m_2}{m_1+m_2} )u_1+( \frac{2m_2}{m_1+m_2} )u_2 $
and $ v_2=( \frac{2m_1}{m_1+m_2} )u_1+( \frac{m_1-m_2}{m_1+m_2} )u_2 $
on putting the values $ v_1=6m/s $
and $ v_2=12m/s $
