Two Blocks Are at Rest on a Horizontal Frictionless Surface

question 65

Multiple Choice

Two blocks are at rest on a horizontal frictionless surface with a compressed spring between them.The 15.0-kg block accelerates when the string holding the system in compression is cut and the 30.0-kg box accelerates in the opposite direction.What is the magnitude of the force from the expanding spring on the 30.0-kg box when the 15.0-kg box is undergoing an acceleration of 5.00 m/s²?

• A)37.5 N
• B)150 N
• C)225 N
• D)75.0 N
• E)0 N

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