The velocity after 5 second =19 m/s
Further explanation
Given
Initial velocity =vi = 12 km/h=3.3 m/s
Time=t = 5 s
Acceleration=a = 2 m/s²
Required
Final velocity, vf
Solution
Motion with constant acceleration
Can be formulated :
vf=vi+at
Input the value :
vf=3.3+2.5
vf=9+10
vf=19 m/s