$A$ body of mass $30 \ kg$ moving with a velocity $20 \ ms^{-1}$ undergoes a one-dimensional elastic collision with another ball of the same mass moving in the opposite direction with a velocity of $30 \ ms^{-1}$. After the collision,the velocities of the first and second bodies respectively are:
- A$-30 \ ms^{-1}, 20 \ ms^{-1}$
- B$30 \ ms^{-1}, 30 \ ms^{-1}$
- C$30 \ ms^{-1}, 20 \ ms^{-1}$
- D$40 \ ms^{-1}, 15 \ ms^{-1}$
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