Answer:
a)
, b) 
Explanation:
a) The equation for vertical velocity is obtained by deriving the function with respect to time:

The velocities at given instants are, respectivelly:


The magnet needs to be held above the coils of wires
Answer:0.3meters
Explanation:
wavelength=velocity ➗ frequency
wavelength=300.80 ➗ 1030.80
Wavelength=0.3m