A 100 g block is connected to a horizontal massless spring of force constant `25.6(N)/(m)` As shown in Fig. 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 postive x-direction indecated in Fig. The position time `(x-t)` graph of motion of the block is as shown in Fig.
Q. When the block is at position B on the graph its.

Options

A. (a)position and velocity both are negative
B. (b)position and velocity both are positive.
C. (c)position is negative and velocity is positive.
D. (d)position is positive and velocity is negative.

Answer

D

Explanation

At position B, x is positive and `(dx)/(dt)` is negative.