You throw a rock horizontally off a cliff with a speed of 20 m/s ...

[D2AR0N]

You throw a rock horizontally off a cliff with a speed of 20 m/s and no significant air resistance. After 2.0 s, the magnitude of the velocity of the rock is closest to
 
  A) 28 m/s
  B) 20 m/s
  C) 40 m/s
  D) 37 m/s

Question 2

A double-slit interference experiment is performed in the air. Later, the same apparatus is immersed in benzene (which has an index of refraction of 1.50), and the experiment is repeated.
 
  When the apparatus is in benzene, you observe that the interference fringes are
  A) more widely spaced than when the apparatus is in air.
  B) equally spaced as when the apparatus is in air.
  C) more closely spaced than when the apparatus is in air.

[frejo]

Answer to Question 1

A

Answer to Question 2

C

[D2AR0N]

Gracias!

[upturnedfurball]

Excellent