5 metres from a fixed point on a level surface.

Hi, can you please help me to solve this:

A mass attached to an extended spring is held at an initial displacement of x = 0.5 metres from a fixed point on a level surface. The mass is then released and the spring allowed to contract freely with an oscillating motion along a straight line about the fixed point (x = 0). If the velocity of the motion is described by the formula v(t) = − π/4*sin(πt/ 2 ) metres per second , what is the formula for the displacement x(t)? In particular, what is the displacement when t = 2 seconds?