Answer:
Both warming up and cooling down or not important
Answer:
decreases
Explanation:
The angular frequency of the mass is given by

where, k is the spring constant and m be the mass of the body which is doing oscillations.
if the mass of the body increases, so the value of angular frequency decreases, as the angular frequency is inversely proportional to the square root of the mass of the body.

Actually Welcome to the Concept of the Waves.
Wavelength is the distance between two consecutive crest or trough.
hence, here the distance is 10cm
So the wavelength is 10cm
===> 10 cm
With another person on student A’s side. I’m sorry if I wasn’t able to help. Im trying my best from the information given. :)