A smooth sphere is moving on a horizonta...

A smooth sphere is moving on a horizontal surface with velocity vector `3hati+hatj` immediately before it hits a vertical wall. The wall is parallel to the vector `hatj` and the coefficient of restitution between the wall and the sphere is `1//3`. The velocity vector of the sphere after it hits the wall is :

`3hati-1/3 hatj`

`-hati+hatJ`

`hati-hatj`

`-hati-1/3hatj`

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