Physics

Problem

A particle moves along the

x

–axis with velocity

v(t)=3t-6\,\text{m s}^{-1}

. Calculate its instantaneous speed at

t=1\,\text{s}

. a)

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

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

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

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