The position of a body moving on a coordinate line is given by [math] for [math], with [math] in meters and [math] in seconds.

(a) Find the body's displacement and average velocity for the given time interval.
Displacement = [math]
Average velocity = [math]

(b) Find the body's velocity at the endpoints of the interval.
Velocity at [math] is [math]
Velocity at [math] is [math]

(c) Find the body's acceleration at the endpoints of the interval.
Acceleration at [math] is [math]
Acceleration at [math] is [math]

(d) When, if ever, during the interval does the body change direction? If there is more than one answer, enter a comma separated list. If the body never changes direction during the interval, enter NONE.
[math] [math]