Tolong jawab yaaaa Secepatnya!!!

y= A sin 2π/T( t+ x/v)

a. Amplitudo = 20cm= 0,2m

b.lamda =2π/T
= 2π/0,25
= 8π

c. lamda = 2πf
8π=2π/f
f = 2π/8π
f = 0,25 Hz
d. v=f x lamda
v= 0.25 x 8
v= 2m/s