If you run a complete loop around an outdoor track (400 m) in 100 ...

[crobinson2013]

If you run a complete loop around an outdoor track (400 m) in 100 s, your average velocity is
 
  A) 0.25 m/s.
  B) 4.0 m/s.
  C) 40,000 m/s.
  D) zero.
  E) 4.00 km/s.

Question 2

Dust and smoke blown up into the Earth's atmosphere from the massive impact of an asteroid 65 million years ago
 
  A) removed most of the oxygen in the Earth's atmosphere by oxidation
  B) rapidly escaped into space, having very little effect on the Earth's climate
  C) blocked sunlight, causing global temperatures to fall on the Earth and subsequently shutting down photosynthesis for up to a year
  D) trapped heat in the Earth's atmosphere, causing global temperatures to rise

[mfedorka]

Answer to Question 1

D

Answer to Question 2

C

[crobinson2013]

Excellent

[Bigfoot1984]

Gracias!