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An object with a mass 10 *kg* moves at a constant velocity of 10 *m*/*sec*. A constant force then acts for 4 second on the object and gives it a speed of 2 *m*/*sec* in opposite direction. The acceleration produced in it, is** **

(1) 3 m/sec^{2}

(2) –3 m/sec^{2}

(3) 0.3 m/sec^{2}

(4) –0.3 m/sec^{2}