Question

A world-class sprinter can reach a top speed (of about 11.5m/s) in the first 15.0m of a race. What is the average acceleration of this sprinter and how long does it take her to
reach that speed?​

Answer 1

Answer:

Explanation:

Assuming the sprinter is accelerating from a full stop (v=0), then:

v²=u²+2as

11.5²=0²+2a(15)

a=11.5²/36

=3.67361 m/s² is his acceleration

And

v=u+at

11.5=0+3.67361t

t=11.5/3.67361

=3.13 seconds time ………………