Posted by Emily on Tuesday, September 4, 2012 at 6:34am.
A simple model for a person running a 100m race is to assume the sprinter runs with constant acceleration until reaching top speed, and then maintains that speed through the finish line. If a sprinter reaches their top speed of 11.2ms1 in 2.15s, what will be their total time?

science  Steve, Tuesday, September 4, 2012 at 10:23am
the acceleration is
a = 11.2m/s / 2.15s = 5.21m/s^2
during the 2.15s, the distance
s = 1/2 at^2 = 1/2 (5.21)(2.15^2) = 12.04m
so, the runner runs
12.04m in 2.15s
87.96m at 11.2m/s = 7.85s
total time is thus 10.00s
Answer This Question
Related Questions
 physics  One simple model for a person running the 100m dash is to assume the ...
 Physics (College)  One simple model for a person running the 100 m dash is to ...
 Physics  A sprinter accelerates at the start of the race at 8.5 m/s^2. After 1....
 Physics  The best sprinters can run a 100 m in 10.0 s. A 77.2 kg sprinter ...
 Physics  A sprinter starts from rest and reaches his top speed in 4 seconds ...
 physics  A sprinter can accelerate with constant acceleration for 2.10s before ...
 physics  in a 100m race, 2 sprinters finish at the same time of 10.2 seconds, ...
 Physics  A sprinter can accelerate with constant acceleration for 2.70 s before...
 maths  two sprinters runs the same race of 100m. One runs at a speed of 10m/s ...
 physics  A sprinter in a race can run 100m in 11.4 seconds. If it takes him 4.2...
More Related Questions