When sprinting, Rich can accelerate at $0.5$ $m$ $/$ $s^2$ . How many seconds would it take Rich to sprint a distance of 200 m if he starts from rest?

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Answer 1 · 2015-12-09T17:49:27

$28.28"s"$

Use:

$s=ut+1/2at^2$

Since $u=0$ then

$s=1/2at^2$

$:.t=sqrt((2s)/a)=sqrt((2xx200)/(0.5))=28.28"s"$

This assumes that he maintains the same acceleration throughout the race.

When sprinting, Rich can accelerate at 0.50.5 mm//s^2s^2. How many seconds would it take Rich to sprint a distance of 200 m if he starts from rest?