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A uniform solid disc of mass \( 1 \mathrm{~kg} \) and radius \( 1 \mathrm{~m} \) is kept on a rough horizontal surface. Two forces of magnitudes \( 2 \mathrm{~N} \) and \( 4 \mathrm{~N} \) have been applied on the disc as shown in the figure. If there is no slipping then the linear acceleration of the centre of mass of the disc is
(1) \( 4 \mathrm{~m} / \mathrm{s}^{2} \)
(2) \( 2 \mathrm{~m} / \mathrm{s}^{2} \)
(3) \( 1 \mathrm{~m} / \mathrm{s}^{2} \)
(4) zero
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