A ball vibrates back and forth from the free end of an ideal ...

[Mimi]

A ball vibrates back and forth from the free end of an ideal spring having a force constant (spring constant) of 20 N/m. If the amplitude of this motion is 0.30 m,
 
  what is the kinetic energy of the ball when it is 0.30 m from its equilibrium position?
  A) 0.00 J
  B) 0.22 J
  C) 0.45 J
  D) 0.90 J
  E) 1.4 J

Question 2

What is the charge on 1.0 kg of protons? (e = 1.60  10-19 C, mproton = 1.67  10-27 kg)
 
  A) 1.0 C
  B) 1000 C
  C) 9.6  107 C
  D) 6.0  1026 C
  E) 6.0  1023 C

[cascooper22]

Answer to Question 1

A

Answer to Question 2

C

[Mimi]

Great answer, keep it coming

[scikid]

Wow, this really help