Velocity of a particle of mass 2 kg changes from m/s to m/s after colliding with a plane surface 

a) 
The angle made by the plane surface with the positive axis is 
b) 
The angle made by the plane surface with the positive axis is 
c) 
The direction of change in momentum makes an angle with the positive axis 
d) 
The direction of change in momentum makes an angle with the plane surface 
Velocity of a particle of mass 2 kg changes from m/s to m/s after colliding with a plane surface 

a) 
The angle made by the plane surface with the positive axis is 
b) 
The angle made by the plane surface with the positive axis is 
c) 
The direction of change in momentum makes an angle with the positive axis 
d) 
The direction of change in momentum makes an angle with the plane surface 
(a,c)
Impulse is change in momentum. Hence, impulse
As impulse is in the normal direction of colliding surface