Person A is standing on the top of a building of height 25 m he wants to throw his gun to person B who stands on top of another building of height 20 m at distance 15 m from first building. The horizontal speed for which it possible is (g=10 m/s²)

• A

  $5 {\mathrm{ms}}^{-1}$

• B

  $10 {\mathrm{ms}}^{-1}$

• C

  $15 {\mathrm{ms}}^{-1}$

• D

  $20 {\mathrm{ms}}^{-1}$