Question

4. A sprinter begins from rest and accelerates at the rate of 2 m/s2 for 200 m.

a) What is the sprinter's velocity at the end of the 200 m?
b) How long does it take him to cover it?
c) What is his average velocity?

Answer 1

v=28.28m/s t=14.14s average velocity =2m/s

Step-by-step explanation:

Starting at rest the initial velocity is 0 substituting that in the first equation of motion v=u+atgives the final velocity but we first have to determine the time using the third equation of motion which is s=ut+1/2at^2 and then do the substitution. Average velocity is the determined by adding the initial and final velocity then divide it by 2