Answer:
Projectile motion is a form of motion where an object moves in a bilaterally symmetrical+ parabolic path.
Explanation:
C. 340
Frequency is the number of wavelengths per second and since the length is 0.5 you multiply 0.5*686 and get 343.
the question not allowing for one position thus the answer is c
I calculated on a sheet and used differentiation to solve the problems.
I think wavelength is the correct answer. Correct me if Im wrong. Hope this helps!