Two particles 
and 
each of mass 
lie at rest on the 
-axis at points 
and 
, respectively. A third particle 
of mass 
initially at the origin moves towards the particle 
. If all the collisions of the system of 3 particles are elastic and head on, the total number of collisions in the system is
Text Solution
Verified by ExpertsA
According to question, three particles are situated as shown below,
After Ist collision velocity of balls will be as shown. 
will slow down to 
will collide with 
on left. After 2nd collision 
will further slow down and will not collide again.
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