C
Explanation:
that's just what I learned in school
Because they are different they all show different traits.
Wavelength = speed / frequency
(345 m/s) / (20,000 Hz) = 0.017 m
Answer:
Acceleration, 
Explanation:
Initial speed of the skater, u = 8.4 m/s
Final speed of the skater, v = 6.5 m/s
It hits a 5.7 m wide patch of rough ice, s = 5.7 m
We need to find the acceleration on the rough ice. The third equation of motion gives the relationship between the speed and the distance covered. Mathematically, it is given by :




So, the acceleration on the rough ice
and negative sign shows deceleration.