From a rifle of mass `4kg`, a bullet of mass `50g` is fired with an initial velocity of `35m//s`. Calculate the initial recoil velocity of the rifle.

Explanation

To solve the problem of calculating the initial recoil velocity of the rifle when a bullet is fired, we will use the principle of conservation of linear momentum. Here’s a step-by-step solution:

### Step 1: Identify the given data
- Mass of the rifle (m2) = 4 kg
- Mass of the bullet (m1) = 50 g = 50/1000 kg = 0.05 kg
- Velocity of the bullet (v1) = 35 m/s

### Step 2: Write the conservation of momentum equation
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