Transverse waves is the answer.
Hope I helped if you need anything else ask me
Answer:
B
Explanation:
the balloon has a negative charge and the metal sphere has a positive charge
Answer:5.60 m/s
Explanation:
Given
Coefficient of static friction 
Coefficient of kinetic friction 
mass of crate 
Force applied 
maximum static Friction 



thus applied force is greater than Static friction therefore kinetic friction will come into play


net Force on crate 

Magnitude of velocity can be obtained by using

where v=final velocity
u=initial velocity
a=acceleration
s=displacement
here initial velocity is zero as crate start from rest


It's attached by earths gravity that keeps it the same force to stay anchored