Question

A weight suspended from a spring is seen to bob up and down over a distance of 37 cm twice each second.
What is frequency in units of Hz?
What is the period in units of s.?
What is the amplitude in units of cm?

Answer 1

"twice each second" means the same thing as 2 per second or 2 Hz.

1 divided by the frequency is the period. If there are two vibration periods in 1 second, how long does it take to have one vibration?

37 cm is twice the amplitude