Work Energy And Power Question 125

Question: Four smooth steel balls of equal mass at rest are free to move along a straight line without friction. The first ball is given a velocity of 0.4 m/s. It collides head on with the second elastically, the second one similarly with the third and so on. The velocity of the last ball is [UPSEAT 2004]

Options:

A) $ 0.4m/s $

B) $ 0.2m/s $

C) $ 0.1m/s $

D) $ 0.05m/s $

Show Answer

Answer:

Correct Answer: A

Solution:

In head on elastic collision velocity get interchanged (if masses of particle are equal). i.e. the last ball will move with the velocity of first ball i.e 0.4 m/s



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