[填空题]
A fisherman’s scale stretches 3.6 cm when s-4qngiuis9 c ,jm5.r a 2.7-kg flm7/7*t 3 ;humokpodcish hangs from it. (a) What is the spring stiffness constant op* o 7 lm3tkm;hudc7/$\approx$ 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)