Answer:
The speed of the wave is 15ms .
Explanation:
The rubber ducky was able to float because it’s density was less than the water. Water has a density of 1, meaning the rubber ducky must have a density lower than 1.
To develop this problem it is necessary to use the concepts related to Impulse.
The impulse is defined as the change in velocity at the rate of mass, that is

Where,
m = Mass
Change in Velocity
This change in velocity can be expressed as,




Therefore the magnitude of the impulse is 4.32 Kg.m/s
The term that describes the movement of an object under the influence of gravity without air resistance is free fall
W=mg
W=75(1.6)
W=120N
a. 120N