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Krishiamae130go
Answered

a runner covers the last straight stretch of a race in 4 sec. during that time he speeds up from 5 m/s to 9m/s what is the runners acceleration in this part of the race?​

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7Nezuko7go

Answer:

1m/s^2

Explanation:

We can use the Kinematic relationship.

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

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