A particle of mass \(m\) is moving in \(yz\text-\)plane with a uniform velocity \(v\) with its trajectory running parallel to the \(+\text{ve}\) \(y\text{-}\)axis and intersecting \(z\text{-}\)axis at \(z=a\) in the figure. The change in its angular momentum about the origin as it bounces elastically from a wall at \(y\) = constant is:
| 1. | \(mva~\hat e_{x}\) | 2. | \(2mva~\hat e_{x}\) |
| 3. | \(ymva~\hat e_{x}\) | 4. | \(2ymva~\hat e_{x}\) |
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