Two paper screens A and B are separated by 150 m. A bullet pierces A and then B. The hole in B is 15 cm below the hole on screen A. If the bullet is travelling horizontally at the time of hitting A, then the velocity of the bullet at A is : (Take g = 10 ms^-2)

• A

  $100\sqrt{3}{\mathrm{ms}}^{-1}$

• B

  $200\sqrt{3}{\mathrm{ms}}^{-1}$

• C

  $300\sqrt{3}{\mathrm{ms}}^{-1}$

• D

  $500\sqrt{3}{\mathrm{ms}}^{-1}$