The gravitational potential due to a mass distribution is `V=A/sqrt(x^2+a^2)`. Find the gravitational field.

Explanation

To find the gravitational field \( \mathbf{E} \) from the given gravitational potential \( V = \frac{A}{\sqrt{x^2 + a^2}} \), we can follow these steps:

### Step 1: Understand the relationship between gravitational field and potential
The gravitational field \( \mathbf{E} \) is related to the gravitational potential \( V \) by the equation:
\[ \mathbf{E} = -\nabla V \]
This means we need to take the gradient (or partial derivatives) of the potential \( V \) and then negate it.
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