2 Answers

Neghez · Answer 1 · 2018-05-26T13:42:32+0000

Let

D------> change in velocity in
(m)/(s)}

a------> acceleration in
(m)/(s^(2))

t-------> is the time in sec

we know that

$a=(D)/(t) \\ \\ D=a*t$

Find the change in velocity for each case

case 1) Kyra

$a=5.2\ (m)/(s^(2)) \\ \\ t=6.9\ s$

Substitute in the formula above

$D=a*t\\ D=5.2*6.9\\ D=35.88\ (m)/(s)$

case 2) Dustin

$a=8.3\ (m)/(s^(2)) \\ \\ t=3\ s$

Substitute in the formula above

$D=a*t\\ D=8.3*3\\ D=24.9\ (m)/(s)$

case 3) Diego

$a=6.5\ (m)/(s^(2)) \\ \\ t=4.2\ s$

Substitute in the formula above

$D=a*t\\ D=6.5*4.2\\ D=27.3\ (m)/(s)$

So

The list from greatest to lowest change in velocity is

Kira (
$35.88\ (m)/(s)$ ) → Diego (
$27.3\ (m)/(s)$ ) → Dustin (
$24.9\ (m)/(s)$ )

therefore

the answer is the option

d. Kira → Diego → Dustin

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