Question : A body of mass 10 kg is moving with a constant velocity of 10 ms−1 . When a constant force acts for 4 s on it, it moves with velocity 2 ms−1 in the opposite direction. The acceleration produced in it is
(A) 3ms^{-2}
(B) -3ms^{-2}
(C) 0.3ms^{-2}
(D) -0.3ms^{-2}
Answer : option (B)
Solution :
