import java.util.*;

public class Force {
    private Acceleration acceleration;
    private Map.Entry<Double, Double> value;

    public Force(Acceleration acceleration) {
        this.acceleration = acceleration;
    }

    public void gravity(double y) {
        this.value = new AbstractMap.SimpleEntry<>(0.0, y);
        acceleration.updateByForce(value);
    }

    public Map.Entry<Double, Double> getValue() {
        return value;
    }
}