A 0.16-kg block on a horizontal frictionless surface is attached ...

[notis]

A 0.16-kg block on a horizontal frictionless surface is attached to an ideal spring whose force constant (spring constant) is 360 N/m.
 
  The block is pulled from its equilibrium position at x = 0.000 m to a position x = +0.080 m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. When the position is x = -0.037 m, what is the acceleration of the block?
  A) 83 m/s2
  B) 43 m/s2
  C) 64 m/s2
  D) 270 m/s2
  E) 370 m/s2

Question 2

A block attached to an ideal spring of force constant (spring constant) 15 N/m executes simple harmonic motion on a frictionless horizontal surface.
 
  At time t = 0 s, the block has a displacement of -0.90 m, a velocity of -0.80 m/s, and an acceleration of +2.9 m/s2 . The mass of the block is closest to
  A) 2.3 kg
  B) 2.6 kg
  C) 4.7 kg
  D) 9.4 kg

[bfulkerson77]

Answer to Question 1

A

Answer to Question 2

C

[notis]

TYSM

[steff9894]

Excellent