OnlineCBT
Physics · WORK, ENERGY AND POWER
हिन्दीA block on a frictionless horizontal table is connected to a spring of spring constant \( k \). If the work done by the spring force when the block moves from \( x = x_i \) to \( x = x_f \) is zero, then which of the following conditions must hold true?
Correct answer · Option 4
\( |x_i| = |x_f| \)
Explanation
Work done by the spring force is \( W_s = \frac{1}{2}k(x_i^2 - x_f^2) \). For \( W_s = 0 \), we need \( x_i^2 = x_f^2 \), which implies \( |x_i| = |x_f| \).
