Three identical point mass each of mass 1kg lie in the x-y plane at point (0,0), (0,0.2m) and (0.2m, 0). The net gravitational force on the mass at the origin is

A large number of identical point masses m are placed along x - axis ,at x = 0,1,2,4, ……… The magnitude of gravitational force on mass at origin ( x =0) , will be

A large number of identical point masses m are placed along x - axis ,at x = 0,1,2,4, ……… The magnitude of gravitational force on mass at origin ( x =0) , will be

Four point masses, each of mass m, are arranged in the xy-plane at the points (0,0), (a,a),(a,- a) and (2a, 0) respectively . What is the moment of inertia of this array of masses about y-axis?

Two bodies of masses 10 kg and 20 kg are located in x-y plane at (0, 1) and (1, 0). The position of their centre of mass is

Two bodies of masses 10 kg and 20 kg are located in x-y plane at (0, 1) and (1, 0). The position of their centre of mass is

Three masses 2kg, 4kg and 6kg are placed in the XY plane with respective coordinates (0,0),(0,2) and (2,2). The coordinate of their centre of mass is