[填空题]
A fisherman’s scale strl k cr-y4otz70kg qs1-/b:2(dqltrjsw 0cmp,etches 3.6 cm when a 2.7-kg fish hangs from it. (a) What is the spring sti1t,grcl j kp2bm q (0dsq-w/:sffness 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)