11. 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 runner's acceleration in this part of the race?
11. 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 runner's acceleration in this part of the race?
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
1m/s^2
Explanation:
We can use the Kinematic relationship:
[tex]vf=vi+at[/tex]
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
Explanation:
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