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The force applied on a stationary body varies directly with the acceleration with which it starts to move. If a force of \( 10 \mathrm{~N} \) is applied on a stationary body, it starts to move with an acceleration of \( 2 \mathrm{~m} / \mathrm{sec}^{2} \). Find the force (in \( \mathrm{N} \) ) to be applied on the body at which it starts to move with an acceleration of \( 4 \mathrm{~m} / \mathrm{sec}^{2} \).
(a) 30
(b) 20
(c) 40
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