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i am working on a problem, but not having found the solution yet.

i have a wall section (in a 2D x-y plane) on which spherical balls hit and get reflected.

i know the x-velocity and y-velocity of the particle when it hits the wall.

i need to calculate the impact (incident) angle of the ball on the wall.

it is easy to calculate when the plane is either along x-axis or y-axis. but, my plane is curvilnear (i know the radius of curvature). can i calculate the incident angle for this curvilinear plane ?

pls help. thank you.

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# Homework Help: The angle @ which the particle hits the wall

**Physics Forums | Science Articles, Homework Help, Discussion**