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An object of mass \( 10 \mathrm{~kg} \) moves at a constant velocity of \( 10 \mathrm{~m} / \mathrm{sec} \). A constant force then acts for 4 seconds
\( \mathrm{P} \) on the object and gives it a speed of \( 2 \mathrm{~m} / \mathrm{sec} \) in

W opposite direction. The acceleration produced in it, is
(1) \( 3 \mathrm{~m} / \mathrm{sec}^{2} \)
(2) \( -3 \mathrm{~m} / \mathrm{sec}^{2} \)
(3) \( 0.3 \mathrm{~m} / \mathrm{sec}^{2} \)
(4) \( -0.3 \mathrm{~m} / \mathrm{sec}^{2} \)
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