Physics equations/Kinematics/More problems

Example 1:  A particle starting at the origin has moved 27 m in 9 s. Find $$\bar{v}$$.

$$\bar{v} = \frac{x_f-x_i}{t_f-t_i}

= \frac{27\ \mathrm{m} - 0\ \mathrm{m}}{9\ \mathrm{s}-0\ \mathrm{s}}

= 3\ \mathrm{m}/\mathrm{s}$$

Example 2: A particle starting 23 m from the origin has moved to 43 m in 5 s. Find $$\bar{v}$$.

$$\bar {v} = \frac{x_f-x_i}{t_f-t_i}

= \frac{43\ \mathrm{m}-23\ \mathrm{m}}{5\ \mathrm{s} - 0\ \mathrm{s}}

= \frac{20\ \mathrm{m}}{5\ \mathrm{s}}

= 4\ \mathrm{m}/\mathrm{s} $$