A 100 g block is connected to a horizontal massless spring of force constant 25.6 N/m. As…

Physics · JEE Advanced · NTA ExamsOscillations and Waves


A 100 g block is connected to a horizontal massless spring of force constant 25.6 N/m. As shown in figure (a ), the block is free to oscillate on a horizontal frictionless surface. The block is displaced 3 cm from the equilibrium position and, at t = 0, it is released from rest at x= 0 . It executes simple harmonic motion with the positive x-direction indicated in figure ( a).
The position-time(x-t) graph of motion of the block is as shown in figure (b ).
\[\text { (a) }\]
When the block is at position A on the graph, its
  1. position and velocity both are negative
  2. position is positive, and velocity is negative
  3. position is negative, and velocity is positive
  4. position and velocity both the positive

Answer

(B) position is positive, and velocity is negative

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