OnlineCBT
Physics · LAWS OF MOTION
हिन्दीA body of mass \( m \) is connected between two identical light springs, each of spring constant \( k \), arranged in parallel on a horizontal frictionless table. If the body is pulled horizontally so that the system experiences a total stretch of \( x \), the work done against the net restoring spring force is:
Correct answer · Option 2
\( k x^2 \)
Explanation
For parallel springs, equivalent spring constant \( k_{eq} = k + k = 2k \). Work done against restoring force is \( W = \frac{1}{2} k_{eq} x^2 = \frac{1}{2} (2k) x^2 = k x^2 \).
