A balloon has a mass of 10 gram in air. The air escapes from the balloon at a unifrom rate with a velocity of `5 cm //s` and the balloon shrinks completely in 2.5 s . Calculate the average force acting on the balloon.

Explanation

To solve the problem, we need to calculate the average force acting on the balloon as the air escapes. We will follow these steps:

### Step 1: Understand the given data
- Mass of the balloon (m) = 10 grams = 0.01 kg (since 1 gram = 0.001 kg)
- Velocity of escaping air (v) = 5 cm/s = 0.05 m/s (since 1 cm = 0.01 m)
- Time taken to shrink completely (t) = 2.5 s

### Step 2: Calculate the total mass of air that escapes
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