Supposing Newton’s law of gravitation for gravitation forces F_{1} and F_{2} between two masses m_{1} and m_{2} at positions r_{1} and r_{2} read F_{1} = -F_{2} = -(r_{12}/r_{12}^{3})GM_{o}^{2}(m_{1}m_{2}/M_{o}^{2})^{n} where M_{0} is a constant of dimension of mass, r_{12} = r_{1} – r_{2} and n is a number. In such a case,

(a) the acceleration due to gravity on earth will be different for different objects.

(b) none of the three laws of Kepler will be valid.

(c) only the third law will become invalid.

(d) for n negative, an object lighter than water will sink in water.