Mathematics

Problem

The displacement of a particle moving in a straight line is given by

x = 3t + 2

(metres). Find its instantaneous velocity at

t = 4\,\text{s}

. a)

14\,\text{m s}^{-1}

3\,\text{m s}^{-1}

12\,\text{m s}^{-1}

5\,\text{m s}^{-1}