A 020-Kg Block Rests on a Frictionless,level Surface and Is Attached

question 49

Multiple Choice

A 0.20-kg block rests on a frictionless,level surface and is attached to a horizontally aligned spring with a spring constant of 80 N/m.The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic motion.A frictional force of 0.3 N exists between the block and surface.What is the speed of the block when it passes through the equilibrium point after being released from the 4.0-cm displacement point?

• A) 0.45 m/s
• B) 0.63 m/s
• C) 0.72 m/s
• D) 1.2 m/s

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