Asinusoidal wave travels along a string. if the time for a particular point to move from maximum displacement to zero displacement is 0.17 sec, what are the period and frequency? if the wavelength is 1.4 m what is the velocity?

The time it takes for a point to reach 0 displacement from maximum displacement is of a cycle. Thus, one period () will take .

The frequency is simply .

The speed is given by:

The answer is  a.first and third quarters 

Initial velocity,  u = 4.9 m/sfinal velocity = v m/sinitial height,  h₁ =  245 m    final height, h₂ = 0a = -9.8  m/s²time taken = t secondss = ut + 0.5at²⇒  (h₂-h₁) = ut + 0.5at²⇒  0-245 = 4.9t + 0.5×(-9.8)×t²⇒ -245 = 4.9t - 4.9t²⇒ 4.9t² -4.9t -245 =0solving it, we get   t = 7.59sv  = u +  at = 4.9 -9.8×7.59 = 4.9 - 74.38 = -69.48 m/svelocity is  69.48 m/s downward