An observer located at Earth's North Pole (90N latitude) would ...

[bcretired]

An observer located at Earth's North Pole (90N
  latitude) would observe that all of the stars
  a) move eastward across the sky.
  b) rise in the east and set in the west.
  c) move in concentric circles about the North Star.
  d) are completely stationary in the sky.

Question 2

A 0.40-kg particle moves under the influence of a single conservative force. At point A where the particle has a speed of 10 m/s, the potential energy associated with the conservative force is +40 J. As the particle moves from A to B, the force does +25 J of work on the particle. What is the value of the potential energy at point B?
 a. +65 J
  b. +15 J
  c. +35 J
  d. +45 J
  e. 40 J

[Sammyo]

Answer to Question 1

c

Answer to Question 2

b