A mass is attached to the end of a spring and set into oscillation on a horizontal frictionless surface by releasing it from a stretched position. The position of the mass at any time is described by x = (8.4 cm)cos[2xt/(2.58 s)]. Determine the following. (a) period of the motion S (b) frequency of the oscillations Hz (c) first time the mass is at the position x = 0 (d) first time the mass is at the site of maximum compression of the spring S