An aeroplane is moving uniformly at a constant eight under the action of two forces (i) upward force (lift) and (ii) downward force (weight). What is the net force on the aeroplane.

Explanation

To solve the problem of finding the net force on the aeroplane moving uniformly at a constant height under the action of two forces (lift and weight), we can follow these steps:

### Step 1: Identify the Forces Acting on the Aeroplane
The aeroplane is subjected to two forces:
1. **Upward Force (Lift)**: Denote this force as \( F_1 \).
2. **Downward Force (Weight)**: Denote this force as \( F_2 \).

### Step 2: Understand the Condition of Uniform Motion
...