a sprinter in the 100 m dash accelerates from rest to a top speed with a constant 4141791

A sprinter,  in the  100-m  dash,  accelerates   from  rest  to  a top speed  with  a (constant)  acceleration   of  2.80  m/s2 and  maintains  the  top  speed   to  the  end  of  the  dash.   (a) What   time elapsed   and  (b)  what  distance   did  the  sprinter   cover  during the  acceleration   phase  if the total  time  taken  in the  dash  was 12.2 s?

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