In the figure shown, a small ball hits obliquely a smooth and horizontal surface with speed u who...

In the figure shown, a small ball hits obliquely a smooth and horizontal surface with speed u whose x and y-components are indicated. If the coefficient of restitution is 1/2, then its x and y-components v_x and v_y just after collision are respectively
(a) 4  m / s, 1  m / s
(b) 2  m / s, 1  m / s
(c) 2  m / s, 2  m / s
(d) 4  m / s, 2  m / s

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