From a rifle of mass `4kg`, a bullet of mass `50kg` 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 momentum. Here’s a step-by-step solution:

### Step 1: Understand the Conservation of Momentum
According to the law of conservation of momentum, the total momentum before an event must equal the total momentum after the event, provided no external forces act on the system.

### Step 2: Define the Masses and Velocities
- Mass of the rifle (M_rifle) = 4 kg
- Mass of the bullet (M_bullet) = 50 grams = 0.05 kg (since 1 kg = 1000 grams)
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