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Three particles of masses 50 g, 100 g and 150 g are placed at the vertices of an equilateral triangle of side 1 m (as shown in the figure). The (x, y) coordinates of the centre of mass will be : m 3 = 150 g m 2 = 100 g X Y 50 g = m 1 O 0.5 m 1.0 m 60º

1. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ m 12 7 , m 8 3
2. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ m 12 5 , m 4 3
3. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ m 8 3 , m 12 7
4. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ m 4 3 , m 12 7

Correct answer: ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ m 4 3 , m 12 7

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