A small block of mass m is fixed at upper end of a massive vertical spring of spring…
Physics · JEE Advanced · NTA Exams — Oscillations and Waves
A small block of mass m is fixed at upper end of a massive vertical spring of spring constant k = 4 mg/L and natural length ‘10L’. The lower end of spring is free and is at a height L from fixed horizontal floor as shown. The spring is initially unstressed, and the spring-block system is released from rest in the shown position.
At the instant the speed of block is maximum, the magnitude of force exerted by the spring on the block is
- \(\frac{m g}{2}\)
- mg
- zero
- None of these
Answer
(B) mg
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