Four smooth steel balls of equal mass at rest are free to move along a – McqOptions

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1.	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]
A.	\[0.4m/s\]
B.	\[0.2m/s\]
C.	\[0.1m/s\]
D.	\[0.05m/s\]
Answer» B. \[0.2m/s\]

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