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The reflection surface of a plane mirror is vertical.
P A particle is projected in a vertical plane which is

W also perpendicular to the mirror. The initial velocity of the particle is \( 10 \mathrm{~m} / \mathrm{s} \) and the angle of projection is \( 60^{\circ} \). The point of projection is a distance \( 5 \mathrm{~m} \) from the mirror. The particle moves towards the mirror. Just before the particle touches the mirror the velocity of approach of the particle and its image is:
(1) \( 10 \mathrm{~m} / \mathrm{s} \)
(2) \( 5 \mathrm{~m} / \mathrm{s} \).
(3) \( 10 \sqrt{3} \mathrm{~m} / \mathrm{s} \)
(4) \( 5 \sqrt{3} \mathrm{~m} / \mathrm{s} \)
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