calculateAngularSpeed( p0, p1, t0, t1 ) {

		const s = p1 - p0;
		const t = ( t1 - t0 ) / 1000;
		if ( t == 0 ) {

			return 0;

		}

		return s / t;

	}
Calculates the angular speed.

@private
@param {number} p0 - Position at t0.
@param {number} p1 - Position at t1.
@param {number} t0 - Initial time in milliseconds.
@param {number} t1 - Ending time in milliseconds.
@returns {number} The angular speed.