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A body of mass \( 10 \mathrm{~kg} \) is moving with a constant
P velocity of \( 10 \mathrm{~m} / \mathrm{s} \). When a constant force acts for 4 seconds on it, it moves with a velocity \( 2 \mathrm{~m} / \mathrm{sec} \) in the
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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