Function gravitational_force 

pub fn gravitational_force(
    mass_a: f64,
    mass_b: f64,
    distance: f64,
) -> Option<f64>

Computes the gravitational attraction between two point masses.

Formula: F = G * m1 * m2 / r^2

Returns None when either mass is negative, when distance is less than or equal to zero, or when the computed result is not finite.

Examples

use use_gravity::{GRAVITATIONAL_CONSTANT, gravitational_force};

assert_eq!(gravitational_force(1.0, 1.0, 1.0), Some(GRAVITATIONAL_CONSTANT));