In the figure, the ball A is released from rest when the spring is at its natural (unstretched) length. For the block B of mass to leave contact with the ground at some stage, the minimum mass of A m

Question

In the figure, the ball A is released from rest when the spring is at its natural (unstretched) length. For the block B of mass  to leave contact with the ground at some stage, the minimum mass of A must be

Canvas Classes · Accepted Answer

🧠 Released From Natural Length → the Spring Stretches to Twice the Steady Force

Here is the one idea that solves it. Ball A is released (not lowered gently) when the spring is unstretched. So A falls, stretching the spring, and at its lowest point A is momentarily at rest. Because it overshoots, the maximum spring force is twice the steady equilibrium force. That doubled force is what has to lift block B off the ground.

🖼️ Visual Sketch

A string runs over a fixed pulley hanging from the cei

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