A body is traveling in a straight line. The equation of motion is given by

* x*(*t*)=5*t*^{3}+3*t*^{2}-6*t*

where

* x* is given in meters, and

* t* is given in seconds.

The acceleration of the body in
m/s^{2} at *t *= 5.25 seconds most nearly is

6.000

163.5

436.8

752.9

**
HINT**

*
This question of the day was provided by the
courtesy of Professor
Autar Kaw of the
University of South Florida
from the book FE Practice Exam With Complete Solutions *