A bullet of mass 20 g is fired with a velocity of 1000 m/s . After passing through a mud wall 1.5 m thick , its velocity decreases to 400 m/s . Calculate the average resistance offered by the mud wall .

Explanation

To solve the problem step by step, we will calculate the average resistance offered by the mud wall to the bullet.

### Step 1: Convert the mass of the bullet to kilograms
Given:
- Mass of the bullet (m) = 20 g = 20/1000 kg = 0.02 kg

### Step 2: Identify the initial and final velocities
Given:
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