Answer:
The system consists of three identical ball bearings marked
as 1, 2 and 3. Let m be the mass of each ball bearing.
Total kinetic energy of the system
before collision
Case (i) K.E. of the
system after collision
Case (ii) K.E. of the system after collision
Case (iii) K.E. of the
system after collision
Because in an elastic collision, the
kinetic energy of the system remains unchanged. Hence, case (ii) is the only possible
result of the collision.
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