1.

A heavy steel ball of mass greater than 1 kg moving with a speed of 2\[m\,{{\sec }^{-1}}\]collides head on with a stationary ping-pong ball of mass less than 0.1 gm. The collision is elastic. After the collision the ping-pong ball moves approximately with speed                                             [EAMCET 1982]

A.          \[2\,m\,{{\sec }^{-1}}\]
B.                       \[4\,m\,{{\sec }^{-1}}\]
C.          \[2\times {{10}^{4}}\,m\,{{\sec }^{-1}}\]
D.                       \[2\times {{10}^{3}}\,m\,{{\sec }^{-1}}\]
Answer» C.          \[2\times {{10}^{4}}\,m\,{{\sec }^{-1}}\]


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