A neutron having kinetic energy `12.5eV` collides with a hydrogen atom at rest negect the difference in mass between the neutron and the hydrogen atom and assume that the neutron does not leave its of motion find the posible kinetic energy of the neutron after the event

Explanation

To solve the problem of a neutron colliding with a hydrogen atom, we can follow these steps:

### Step 1: Understand the Initial Conditions
We have a neutron with a kinetic energy of 12.5 eV colliding with a hydrogen atom that is initially at rest. The mass difference between the neutron and the hydrogen atom is neglected.

### Step 2: Convert Kinetic Energy to Velocity
The kinetic energy (KE) of the neutron can be expressed in terms of its mass (m) and velocity (v) using the formula:
\[ KE = \frac{1}{2} mv^2 \]
...