Question

A world class sprinter can reach a top speed of about 11.5 m/s for in the first 18m if a race. What is the average acceleration of this sprinter and how long does it take to reach that speed?

Answer 1

Answer:

3.13 seconds time

Explanation:

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

v²=u²+2as

11.5²=0²+2a(18)

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 ………………