A) \[2\,m\,{{\sec }^{-1}}\]
B) \[4\,m\,{{\sec }^{-1}}\]
C) \[2\times {{10}^{4}}\,m\,{{\sec }^{-1}}\]
D) \[2\times {{10}^{3}}\,m\,{{\sec }^{-1}}\]
Correct Answer: B
Solution :
We know that when heavier body strikes elastically with a lighter body then after collision lighter body will move with double velocity that of heavier body. i.e.the ping pong ball move with speed of \[2\times 2=4\ m/s\]
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