A runner covers the last straight stretch of a race in 4 s. During that time, he speeds up from 5 m/s to 9 m/s. What is the runn

Question

4 years ago

10

ers acceleration in this part of the race?

2 answers:

sattari [20] · Answer 1 · 2022-01-23T19:34:37+03:00

8 0

Answer:

1m/s^2

Explanation:

u= 5 m/s

v= 9 m/s

t= 4s

But

a= v-u/t

a= 9-5/4

a= 4/4

a= 1m/s^2

Ne4ueva [31] · Answer 2 · 2022-01-23T22:00:50+03:00

3 0

Answer:

1m/s^2

Explanation:

We can use the Kinematic relationship:

$vf=vi+at$

where:

v f = final velocity;

v i = initial velocity;

a = acceleration;

t = time.

u= 5 m/s

v= 9 m/s

t= 4s

9 = 5 + 4a

4a = 9-5

4a = 4

divide both side by 4

a = 1

a= 1m/s^2