$A$ body of mass $10 \,kg$ has a constant velocity of $10 \,m \,s^{-1}$. $A$ constant force is applied for a duration of $4 \,s$ on the object, which gives it a speed of $2 \,m \,s^{-1}$ in the opposite direction. Find the acceleration produced in it.
- A$3 \,m \,s^{-2}$
- B$-3 \,m \,s^{-2}$
- C$0.3 \,m \,s^{-2}$
- D$-0.3 \,m \,s^{-2}$
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