Accepted Answer
He accelerates at 2.6 m/s^2 for 1.1 seconds, thus over that time his speed increases by 2.6*1.1=2.86m/s. His final speed will thus be 9+2.86=11.86 m/s
He accelerates at 2.6 m/s^2 for 1.1 seconds, thus over that time his speed increases by 2.6*1.1=2.86m/s. His final speed will thus be 9+2.86=11.86 m/s