// calculate bounce based on distance from clown center to trampoline center 

int angle = trampolineRectangle.Center.X - clownRectangle.Center.X + 90; 

float newY = 800 * (float)Math.Sin(MathHelper.ToRadians((float)(angle))); 
float newX = 800 * (float)Math.Cos(MathHelper.ToRadians((float)(angle))); 

clown.Velocity.X = newX; 
clown.Velocity.Y = newY; 

clown.Velocity.Y *= -1; 

clown.Position.Y = trampolinePosition.Y - clown.Texture.Height; 

bounce.Play();