A ball is projected horizontally from a table such that it collides with wall then with ground. ...

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A ball is projected horizontally from a table such that it collides with wall then with ground. If after collision component of velocity perpendicular to the surface is reversed in direction without change in magnitude and - component of velocity parallel to the surface remains unchanged. At what distance from the wall does the ball collide with the ground. \( \left(H=500 \mathrm{~m}, v_{0}=20 \mathrm{~m} / \mathrm{s}\right. \), \( D=100 \mathrm{~m}) \)
(a) \( 100 \mathrm{~m} \)
(b) \( 200 \mathrm{~m} \)
(c) \( 50 \mathrm{~m} \)
(d) \( 150 \mathrm{~m} \)
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