A plane is in level flight at constant speed and each of its wings has an area of `25m^(2)`. If the speed of the air is `180km//h` over the upper wing surface, determine the plane's mass . (Take air density to be `1 kg//m^(3)`). `g=9.8m//s^(2)`.

Explanation

To determine the mass of the plane in level flight, we can follow these steps:

### Step-by-Step Solution:

1. **Convert Speeds from km/h to m/s**:
- The speed of air over the lower wing (V1) is given as 180 km/h.
- Convert V1 to m/s:
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