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Oscillations

# An ideal spring - mass system is oscillating . The one which remains some during the entire S.H.M period is

$(a)\;P.E\;of\;the\;spring\qquad(b)\;K.E\;of\;the\;blrk\qquad(c)\;Mechanical\;energy\;of\;the\;system\qquad(d)\;None\;of\;these$

Answer : (c) Mechanical energy of the system
Explanation :
In S.H.M P.E & K.E keeps on changing but the mechanical energy which P.E+K.E remains constant .