Physics

Problem

A body moves along the

x

-axis such that

x(t)=5-2t

(in metres). Which statement about its instantaneous speed

s

and instantaneous velocity

v

is correct? a)

s=2\,\text{m/s}

and

v=2\,\text{m/s}

s=-2\,\text{m/s}

and

v=2\,\text{m/s}

s=2\,\text{m/s}

and

v=-2\,\text{m/s}

s=v=-2\,\text{m/s}