A smooth sphere is moving on a horizontal surface with a velocity vector 2 i ^ + 2 j ^ m s - 1 immediately…

A smooth sphere is moving on a horizontal surface with a velocity vector 2i^+2j^ m s-1 immediately before it hits a vertical wall. The wall is parallel to the vector j ^  and the coefficient of restitution between the sphere and the wall is e=12. The velocity of the sphere, after it hits the wall, is

  1. i ^ - j ^
  2. - i ^ + 2 j ^
  3. - i ^ - j ^
  4. 2 i ^ - j ^

Solution

12=0-vx2

vx=-1

v→=-i^+2j^

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