Why does someone coming off a slide count as a projectile?

After the proof of concept, does the clip of the guy seem plausible?

Jamie is going 30 mi/hr in about 1.7 s. What distance does he travel in meters?

If the guy traveled 115 ft at a speed of 45 mi/hr, how long was he in the air?

Why do we see that famous curve of the human projectile?

Which part of the myth is confirmed?