A 261 g object attached to a horizontal spring moves in simple harmonic motion with a period of 0.240 s. The total mechanical energy of the spring-mass system is 6.46 J. (a) What is the maximum speed of the object (in m/s)

Consider the phase change taking place in the picture. you could use all but one statement to describe what is happening here. that is: a) temperature is increasing. b) kinetic energy is increasing. c) the space between the particles remains the same. d) the attractive force between the particles is decreasing.