A particle moves along a straight line and its position at time is given by where s is measured in feet and t in seconds.
(A) Find the velocity (in ft/sec) of the particle at time :
(B) Find all values of for which the particle is at rest. (If there are no such values, enter 0. If there are more than one value, list them separated by commas.))

(C) What is the position of the particle at time ?
(D) Finally, what is the TOTAL distance the particle travels between time and time ?

You can earn partial credit on this problem.