A smooth sphere is moving on a horizontal surface with velocity vector 2i+2j immediately before it hits a vertical wall. The wall is parallel to j vector and the coefficient of restitution between the sphere and the wall is e = 1/2 . The velocity vector of the sphere after it hits the wall is:
(A) i -j
(B) -i+ 2j
(C) -i- j
(D) 2i- j
