Using 1000 J of work, a toy elevator is raised from the ground ...

[rl]

Using 1000 J of work, a toy elevator is raised from the ground floor to the second floor in 20 s. How much power does the elevator use?
 
  A) 20 W
  B) 50 W
  C) 100 W
  D) 1000 W
  E) 20,000 W

Question 2

For light waves, different frequencies mean different
 
  A) colors.
  B) speeds.
  C) brightness.
  D) amplitudes.
  E) None of the above.

[aliotak]

Answer to Question 1

Answer: B

Answer to Question 2

A