Answer:
(a): 
(b): 
(c): 
(d): 
(e): 
Explanation:
Given, the position of the particle along the x axis is

The units of terms
and
should also be same as that of x, i.e., meters.
The unit of t is seconds.
(a):
Unit of 
Therefore, unit of 
(b):
Unit of 
Therefore, unit of 
(c):
The velocity v and the position x of a particle are related as

(d):
The acceleration a and the velocity v of the particle is related as

(e):
The particle attains maximum x at, let's say,
, when the following two conditions are fulfilled:


Applying both these conditions,

For
,

Since, c is a positive constant therefore, for
,

Thus, particle does not reach its maximum value at 
For
,

Here,

Thus, the particle reach its maximum x value at time