A97-kg sprinter wishes to accelerate from rest to a speed of 11 m/s in a distance of 21 m. what coefficient of static friction is required between the sprinter's shoes and the track?

coefficient of static friction required between the sprinter's shoes and the track is  u=0.293.

Explanation:-  

The frictional coefficient is found from newton’s second law

We know that  

Compare the Eqn (1) and eqn (2)  

Mass (m) cancel each other both side

So

Coefficient of static friction    

We know that  

Kinetics    

Substitute the value of acceleration in eqn (3)

So that

Coefficient of static friction.

Coefficient of static friction    

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