How far does a wave travel in three cycles
?

60 nm

Explanation:

The wave equation applies:

where f = frequency

          λ = wavelength of the wave

In wave propagation, the wavelength represents one full wave cycle. This is the distance from one crest (peak) or trough (dip) to another crest (peak) or trough (dip). Therefore, a wave or say, 20 nm will have traveled after 3 cycles:

distance = 3 (20nm)

              = 60 nm

it about 600 mph from what i calculated

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be