Its physical weathering and physical weathering can be sometimes called mechanical weathering it includes the processes which break rocks apart changing their chemical composition.
The formula for velocity vf = vi + at
First list your given information
2m/s Is your initial velocity (vi)
6m/s is you final velocity (vf)
2 seconds is your time (t)
Since you want the a for acceleration get a by itself
a = (vf-vi)/t
So a= (6-2)/2
a= 4/2
a=2
Now units
the units for acceleration are m/s

2m/s
Answer:
or 
23.4843749996 m
Yes
Explanation:
E = Electric field = 
c = Speed of light = 
m = Mass of proton= 
q = Charge of electron = 
Acceleration is given by

Dividing by g

The acceleration is
or 

The distance is 23.4843749996 m
The gravitational field is very small compared to the electric field so the effects of gravity can be ignored.