In a race, a runner traveled 12 meters in
4.0 seconds as she accelerated uniformly from
rest. the magnitude of the acceleration of the
runner was
(1) 0.25 m/s2 (3) 3.0 m/s2
(2) 1.5 m/s2 (4) 48 m/s2

     Since it is a race, the runner start from rest, so we can use the Velocity Hourly Equation to describle yours moviment.


 
     Entering the unknowns, we have:



Number 2

If you notice any mistake in my english, please let me know, because i am not native.