A 1.6-kg block on a horizontal frictionless surface is attached ...

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A 1.6-kg block on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 190 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. What is the velocity of the block at time t = 0.40 s? A) 0.82 m/s
  B) -0.82 m/s
  C) 0.30 m/s
  D) -0.30 m/s
  E) 0.00 m/s

Question 2

When a boat sails from fresh water to salt water, the boat will float
 
  A) lower in the water.
  B) higher in the water.
  C) at the same water level.

[Gabe]

Answer to Question 1

A

Answer to Question 2

Answer: B

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[Gabe]

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