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Questions  

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=12. The velocity vector of the sphere after it hits the wall is

a
i¯+2j¯
b
2i¯j¯
c
i¯j¯
d
2i¯2j¯

detailed solution

Correct option is A

 Along wall, velocity is same. 

 Normal to wall V¯=eV¯=I2(2i^)=i^

 Final velocity =i^+2j^

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