Answer:
An arrow represents displacement. Because it's a vector quantity.
Vector quantity= Direction+Magnitude
When an arrow is put above a unit like
it means that it's a vector quantity.
Hope this helps ;) ❤❤❤
Answer:
Visible light has a shorter wavelength than radio waves
In order to calculate frictional force look below..
The formula given by

Or

u is coefficient of friction
N is normal reaction.