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+//developed in windows XP operating system 32bit
+//platform Scilab 5.4.1
+clc;clear;
+//example 11.2
+//calculation of the work done in bringing three particles together
+
+//given data
+m1=100*10^-3//masss(in kg) of particle1
+r=20*10^-2//separation(in m) between the two particles
+G=6.67*10^-11//universal constant of gravitation(in N-m^2/kg^2)
+
+//calculation
+//since the work done by the gravitational force is equal to change in the potential energy
+U=3*(-G*m1*m1/r)
+
+printf('the work done in bringing three particles is %3.1e J',U)