Question

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? ​

Answer 1

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