artillery.js

let grav = 9.8

// Velocity is in meters per second
// Angle is in radians
// Initial Height is in meters
// Returns: Horizontal distance travelled by object
function artillery(velocity, angle, initHeight) {
	return Math.pow(velocity, 2) / (2 * grav) * (1 + Math.sqrt(1 + ((2*grav * initHeight) / (Math.pow(velocity, 2) * Math.pow(Math.sin(angle), 2))))) * Math.sin(2*angle)
}

/* Warning: This assumes that:
There is no air resistance
There is a uniform gravity field
*/