A car of mass `m` moving over a convex bridge of radius `r` .Find the normal reaction acting on car when it is at bighest point the bridge.

Explanation

To solve the problem of finding the normal reaction acting on a car of mass `m` when it is at the highest point of a convex bridge of radius `r`, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Scenario**:
- We have a car moving over a convex bridge. At the highest point of the bridge, the forces acting on the car are its weight (downward) and the normal reaction force (upward).

2. **Draw the Free Body Diagram (FBD)**:
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