Find the velocity in m/s of a swimmer who swims 110m toward the shore in 72 s
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The dragster's velocity <em>v</em> at<em> </em>time <em>t</em> with constant acceleration <em>a</em> is
since it starts at rest.
After 2.1 s, it will attain a velocity of
or 92.4 m/s.
Doubling the time would double the final velocity,
so the velocity would be twice the previous one, 184.8 m/s.
The dragster undergoes a displacement <em>x</em> after time <em>t</em> with acceleration <em>a</em> of
if we take the starting line to be the origin.
After 2.1 s, it will have moved
or 88 m.
Doubling the time has the effect of quadrupling the displacement, since
so after 4.2 s it will have moved 352 m.