[填空题]
A fisherman’s scale st s;fj y )b.9wfw2kdecg7l::zfretches 3.6 cm when a 2.7-kg fish haz rdu83,;lx,gdsqn *vngs from it. (a) What ; 8dugl,vnrzs qd* ,3xis the spring stiffness constant $\approx$ N/m
(b) what will be the amplitude and frequency of vibration if the fish is pulled down 2.5 cm more and released so that it vibrates up and down? $\approx$ Hz (round to one decimal place)