In Fig. 13-36a, particle A is fixed in place at x = 0.20 m on the x axis and particle B, with a mass of 1.0 kg, is fixed in place at the origin. Particle C (not shown) can be moved along the x axis, between particle B and x =ˆž. Figure 13-36b shows the x component F_net,_x of the net gravitational force on particle B due to particles A and C, as a function of position x of particle C. The plot actually extends to the right, approaching an asymptote of – 4.17 x 10^-10 N as x ˆž. What are the masses of (a) particle A and (b) particle C?