what is an object's final velocity if it accelerates at 2 m/s/s for 2.3 seconds from a velocity of 50km/h

Question

This is a question from my textbook. I got 18.4m/s but book says it's 19

Answer 1

a = 2 m/s²

t = 2.3 s

v_i = 50000 m / 3600 s = 13.89 m/s

 

 

v_F = v_i + at

 

v_F = (13.89 m/s) + (2 m/s²)(2.3 s)

 

v_F = 18.49 m/s