Amysterious force acts on all particles along a particular line and always points towards a particular point p on the line. the magnitude of the force on a particle increases as the cube of the distance from that point, that is, f∝ r3, if the distance from the p to the position of the particle is r. it has been determined that the constant of proportionality is 0.45 n/m3, i. e. the magnitude of the force on a particle can be written as 0.45r3, when the particle is at a distance r from the force center.