[填空题]
A 0.60-kg mass vibrates according to the equat;tc lx)ye3x8t)*ae:ym4z w 1s ,mfgq-+o fwagion x = 0.45cos6.4t where x is in meters and t is in seconds. Deter aw:q 4, o-afw+gsyfgm*zme1)mine
(a) the amplitude, m
(b) the frequency, $\approx$ J(round to two decimal place)
(c) the total energy, $\approx$ J(round to one decimal place)
(d) the kinetic energy and potential energies when $\approx$ J(round to one decimal place)