The reflecting surface of a plane mirror is vertical. A particle is projected in a vertical plane which is also perpendicular to the mirror. The initial speed of the particle is 10 m/s and the angle of projection is \[{{60}^{o}}\] from the normal of the mirror. The point of projection is at a distance 5 m from the mirror. The particle moves towards the mirror. Just before the particle touches the mirror, the velocity of approach of the particle and the image is:

• A. 10 m/s
• B. 5 m/s
• C. \[10\sqrt{3}\,m/s\]
• D. \[5\sqrt{3}\,m/s\]