A runner covers the last straight stretch of a race in 3 s. During that time, he speeds up from 5 m/s to 11 m/s.What is the runner's acceleration in this part of the race?

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asked Feb 11, 2022 3.2k views

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A runner covers the last straight stretch of a race in 3 s. During that time, he speeds up from 5 m/s to 11 m/s.What is the runner's acceleration in this part of the race?

Mathematics
high-school

Nazer asked

by Nazer

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Answer:

From first Newton's equation of motion:

${ \bf{v = u + at}}$

Substitute the variables:

${ \tt{11 = 5 + (a * 3)}} \\ { \tt{3a = 6}} \\ { \tt{a = 2 \: {ms}^( - 2) }}$

Acceleration is 2 ms-²

Lyise answered Feb 17, 2022

by Lyise

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