Two identical ball bearings in contact with each other and resting on a frictionless table are hit head – on by another ball bearing of the same mass moving initially with a speed v as shown in figure.
If the collision is elastic, which of the following is a possible result after collision?
Text Solution
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:
Let m be mass of each ball bearing.
Total kinetic energy of the system before collision,
In , Kinetic energy of the system after collision,
In , kinetic energy of the system after collision.
In , kinetic energy of the system after collision
In , kinetic energy of the system after collision,
We see that kinetic energy is conserved only in
Hence, is the only possibility
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