Two identical bodies of mass 4 kg each are approaching each other with a speed of 3 m/s , on a frictionless horizontal surface . When the two bodies collide , they stick together and come to rest . Calculate the work done by the external forces and internal forces on the system of blocks .

Explanation

To solve the problem, we will follow these steps:

### Step 1: Understand the system
We have two identical bodies, each with a mass of 4 kg, moving towards each other with a speed of 3 m/s. After colliding, they stick together and come to rest.

### Step 2: Calculate the initial kinetic energy
The initial kinetic energy (KE_initial) of each body can be calculated using the formula:
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