A sphere is moving with velocity vector `2hati+2hatj` immediately before it hits a vertical wall. The wall is parallel to `hatj` and the coefficient of restitution of the sphere and the wall is `e=1/2`. Find the velocity of the sphere after it hits the wall?
A. ` hat i- hatj`
B. `-hati+2hatj`
C. `-hat i-hatj`
D. `2hati-hatj`