An Unusual Spring Has a Restoring Force of Magnitude F

question 7

Multiple Choice

An unusual spring has a restoring force of magnitude F = (2.00 N/m) x + (1.00 N/m²) x², where x is the stretch of the spring from its equilibrium length. A 3.00-kg object is attached to this spring and released from rest after stretching the spring 1.50 m. If the object slides over a frictionless horizontal surface, how fast is it moving when the spring returns to its equilibrium length?

• A) 2.06 m/s
• B) 4.33 m/s
• C) 3.27 m/s
• D) 5.48 m/s
• E) 1.50 m/s

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