Question

What was the average speed of the whole journey?

$Distance/m$	$0$	$1$	$2$	$3$	$4$	$5$	$6$	$6$	$6$	$3$	$0$
$Time/s$	$0$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$

Answer 1

at $t=0s$

$speed=\frac{0}{0}=0m$

at $t=1s$

$speed=\frac{1}{1}=1m$

at $t=2s$

$speed=\frac{2}{2}=1m$

at $t=3s$

$speed=\frac{3}{3}=1m$

at $t=4s$

$speed=\frac{4}{4}=1m$

at $t=5s$

$speed=\frac{5}{5}=1m$

at $t=6s$

$speed=\frac{6}{6}=1m$

at $t=7s$

$speed=\frac{6}{7}=0.857m$

at $t=8s$

$speed=\frac{6}{8}=0.75m$

at $t=9s$

$speed=\frac{3}{9}=0.333m$

at $t=10s$

$speed=\frac{0}{10}=0m$

Therefore the average speed is,

$=\frac{0+1+1+1+1+1+1+0.857+0.75+0.333+0}{11}$

$=\frac{7.94}{11}$

$=0.72m/s$