A 0.025-kg block on a horizontal frictionless surface is attached ...

[Diane]

A 0.025-kg block on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 150 N/m. The block is pulled from its equilibrium position at x = 0.00 m to a displacement x = +0.080 m and is released from rest.
 
  The block then executes simple harmonic motion along the horizontal x-axis. When the displacement is x = 0.024 m, what is the kinetic energy of the block? A) 0.44 J
  B) 0.41 J
  C) 0.46 J
  D) 0.49 J
  E) 0.52 J

Question 2

Chemically, helium is
 
  A) an isotope.
  B) an element.
  C) a mixture.
  D) a solid.
  E) a compound.

[Missbam101]

Answer to Question 1

A

Answer to Question 2

B

[Diane]

TYSM

[dantucker]

Gracias!