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A spring-block system is resting on a frictionless floor as shown in the figure. The spring constant is 2.0 \( \mathrm{N} \mathrm{m}^{-1} \) and the mass of the block is \( 2.0 \mathrm{~kg} \). Ignore the mass of the sprng. Initially the spring is in an unstretched condition. Another block of mass \( 1.0 \mathrm{~kg} \) moving with a speed of \( 2.0 \mathrm{~ms}^{-1} \) collides elastically with the first block. The collision is such that the \( 2.0 \mathrm{~kg} \) block does not hit the wall. The distance, in
\( \mathrm{P} \) metres, between the two blocks when the spring returns to its unstretched position for the first time after the collision is
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