Answer
given,
number of crest (N)= 5
time(t) = 50 s
distance between to successive crest = 32 m
a) Period
  [tex]T = \dfrac{t}{N}[/tex]
  [tex]T = \dfrac{50}{5}[/tex]
 [tex]T = 10\ s[/tex]
b) frequency
  [tex]f = \dfrac{1}{T}[/tex]
  [tex]f = \dfrac{1}{10}[/tex]
  [tex]f =0.1\ Hz[/tex]
c) wavelength
  distance between to consecutive crest is wavelength
  wavelength = 32 m
d) speed
     v = f λ
     v = 0.1 x 32
     v = 3.2 m/s
e) Amplitude
  We cannot determine amplitude because data is not given.