Question

A world-class sprinter can reach a top speed (of about 11.8 m/s ) in the first 20.0 m of a race.

A. What is the average acceleration of this sprinter?
Express your answer with the appropriate units.

B. How long does it take her to reach that speed?
Express your answer with the appropriate units.

Answer 1

Acceleration is 3.406 m/s^2 and time taken is approximately 3 seconds.

Use third and first equation of motion to calculate acceleration and time respectively.

Take u=0 m/s, v=11.8m/s and s=20m.

Hope it helps....