question_answer

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                [CPMT 1971]

A)                              \[3\,m/{{\sec }^{2}}\]          

B)                           \[-3\,m/{{\sec }^{2}}\]          

C)                         \[0.3\,m/{{\sec }^{2}}\]            

D)                           \[-0.3\,m/{{\sec }^{2}}\]