A spherical ball of mass 
collides head on with another ball of mass 
at read. The collision is elastic. The fraction of kinetic energy lost by 
is:
Text Solution
Verified by ExpertsA
: According to momentum conservation, we get
……(i)
Where 
is the initial velocity of spherical ball of mass 
before collision and 
are the final velocities of the balls of masses 
and 
after collision.
According to kinetic energy conservation, we get
…..(ii)
Form Egs. (i) and (ii), it follows that
Or 
Substituting this in Eq. (i) we get
The initial kinetic energy of the mass 
is
The final kinetic energy of the mass 
is
(Using (iii))
The fraction of kinetic energy lost by 
is
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