A disc of mass 100 g is kept floating horizontally in air by firing bullets, each of mass 5 g with the same velocity at the same rate of 10 bullets per second. The bullets rebound with the same speed in opposite direction. Find the velocity of each bullet at the time of impact.

Explanation

To solve the problem, we need to analyze the situation using the principles of momentum conservation. Here's the step-by-step solution:

### Step 1: Understand the Given Information
- Mass of the disc, \( M = 100 \, \text{g} = 0.1 \, \text{kg} \)
- Mass of each bullet, \( m = 5 \, \text{g} = 0.005 \, \text{kg} \)
- Rate of firing bullets, \( R = 10 \, \text{bullets/second} \)
- The bullets rebound with the same speed in the opposite direction.

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