Which of the following stars is the coolest? A) B7 B) G9 C) ...

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Which of the following stars is the coolest?
 
  A) B7
  B) G9
  C) K7
  D) K4

Question 2

To determine the height of a flagpole, Abby throws a ball straight up and times it. She sees that the ball goes by the top of the pole after 0.5 s and then reaches the top of the pole again after a total elapsed time of 4.1 s.
 
  How high is the pole above the point where the ball was launched? A) 10 m
  B) 13 m
  C) 16 m
  D) 18 m
  E) 26 m

[Li Jun]

Answer to Question 1

C

Answer to Question 2

A

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Thank you!

[Li Jun]

Always glad to help...