The time needed is 25 s
Explanation:
Assuming that the sprinter is moving by uniform motion, then we can use the following equation that relates distance, time and speed:
[tex]v=\frac{d}{t}[/tex]
where
v is the speed of the sprinter
d is the distance covered
t is the time elapsed
In this problem, we know that
v = 4 m/s is the speed of the sprinter
d = 100 m is the distance that must be covered
Solving for t, we find the minimum time needed:
[tex]t=\frac{d}{v}=\frac{100}{4}=25 s[/tex]
Learn more about speed:
brainly.com/question/8893949
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