Q. A small ball of mass m starts from rest from point A (b, c) on a smooth slope which is a parabola. The normal force that the ground exerts at the instant, the ball arrives at lowest point (0,0) (take acceleration due to gravity g)

1. mg$\left(\frac{b^2+4c^2}{b^2}\right)$
2. $\frac{4 mg{c}^2}{b^2}$
3. mg
4. 3 mg