A bullet is fired at an angle of `15^(@)` with the horizontal and it hits the ground 3 km away. Can we hit a target at a distance of 7 km by just adjusting its angle of projection ?

Explanation

To solve the problem, we need to determine if we can hit a target at a distance of 7 km by just adjusting the angle of projection, given that a bullet fired at an angle of 15 degrees hits the ground 3 km away.

### Step-by-Step Solution:

1. **Understanding the Range Formula**:
The range \( R \) of a projectile is given by the formula:
\[
R = \frac{u^2 \sin(2\theta)}{g}
...