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Answer:
893 Newtons
Explanation:
m = Mass of Usain Bolt = 94 kg
a = Acceleration of Usain Bolt in the first 0.89 seconds = 9.5 m/s²
From Newton's Second law
Force



The average horizontal force exerted by Bolt against the ground during the first 0.890 s of the race is 893 Newtons
Answer:

Explanation:
Given that,
An object starts from rest at the origin (x₀ = 0) and travels in a straight line with a constant acceleration (a = constant).
The relation between the position (x) and time (t) is given by :

Let v is the velocity of the object.



Let a is the acceleration of the object. It is given by :



So, the acceleration of the object is
. Hence, this is the required solution.