
Arturo O. answered 05/17/20
Experienced Physics Teacher for Physics Tutoring
(a)
From the given formula
2πs2 = 9,8L
get
s = √[9.8L/(2π)]
You have several values of L in meters. Plug then into the equation for s and get s in meters per second. Use the correct value for π (not 13.4).
(b)
The speed increases as wavelength increases.