Two Blocks Are at Rest on a Horizontal Frictionless Surface

question 67

Multiple Choice

Two blocks are at rest on a horizontal frictionless surface with a compressed spring between them.The 10-kg block accelerates when the string holding the system in compression is cut and the 20-kg box accelerates in the opposite direction.What is the magnitude of the force from the expanding spring on the 20-kg box when the 10-kg box is undergoing an acceleration of 8.0 ?

• A)40 N
• B)160 N
• C)(160/3)N
• D)80 N

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