question: Hint: Please answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: One of the most dramatic videos on the web (but entirely fictitious) supposedly shows a man sliding along a long water slide and then being launched into the air to land in a water pool. Let's attach some reasonable numbers to such a flight to calculate the velocity with which the man would have hit the water. Figure indicates the launch and landing sites and includes a superimposed coordinate system with its origin conveniently located at the launch site. From the video we take the horizontal flight distance as $D=20.0 \mathrm{~m}$, the flight time as $t=2.50 \mathrm{~s}$, and the launch angle as $\theta_0=40.0^{\circ}$. Find the magnitude of the velocity at launch and at landing.
  Choices:
  (A) 14
  (B) 10.44
  (C) 44
  (D) 1