PVector pos2 = new PVector();
PVector acc1 = new PVector();
PVector vel1 = new PVector();

float grav = 5000;
float mass = 10;

boolean aiming = false;

void accCalc() {
  PVector  tempAcc = PVector.sub(pos2, pos);
  tempAcc.normalize();
  float tempForce = grav*mass/pow(PVector.dist(pos, pos2), 2);

  tempAcc.mult(tempForce);
  acc1.add(tempAcc);
}

void gravityControl() {
    accCalc();

    vel1.add(acc1);
    vel1.mult(0.3);
    pos.add(vel1);
    acc1 = new PVector();
    acc1.set(0, 0);

  pushMatrix();
  noStroke();
  translate(pos2.x,pos2.y);
  fill(225);
  sphere(50);
  popMatrix();
}

void draw2() {
  gravityControl();
  pos2.x = width/2;
  pos2.y = height/2;
}