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Answer:
12J
Explanation:
Right before it hits the ground, the initial potential energy and the final kinetic energy will equal each other due to conservation of energy.
the answer is d because it has the smallest wavelength
Answer:
a) 
b) 
c) 
d) 
Explanation:
Given:
- distance down the field in the first interval,

- time duration of the first interval,

- distance down the field in the second interval,

- time duration of the second interval,

- distance down the field in the third interval,

- time duration of the third interval,

a)
velocity in the first interval:



b)
velocity in the second interval:



c)
velocity in the third interval:



d)
We know that the average velocity is given as the total displacement per unit time.


