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AP Physics C: Mechanics
2.5 Newton’s Second Law
2.1 Systems and Center of Mass
BeginnerMCQMathematicalConceptual25.1k
A horizontal line represents a frictionless floor. Two rectangular blocks rest on the floor: a block labeled \(m_2\) on the left and a block labeled \(m_1\) on the right. A horizontal zigzag line representing a coiled spring labeled \(k\) connects the right face of block \(m_2\) to the left face of block \(m_1\). A single horizontal vector arrow labeled \(F_0\) starts at the right face of block \(m_1\) and points horizontally to the right. No other labels, lines, text, or axes appear.
Two blocks connected by a spring on a frictionless surface with an applied force.
Two blocks of masses \(m_1\) and \(m_2\) rest on a frictionless horizontal surface and are connected by an ideal spring of spring constant \(k\). A constant horizontal external force of magnitude \(F_0\) is applied to the block of mass \(m_1\), pulling it to the right. At an instant when the spring is stretched by a displacement \(x\) from its unstretched length, what is the magnitude of the acceleration of the center of mass of the two-block system?

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