To determine the final velocity (v) of the car after 5 seconds, given an initial velocity (u) of 72 km/h and an acceleration (a) of 2 m/s^2, we need to convert the initial velocity to m/s and apply the formula:
v = u + at
First, let's convert the initial velocity from km/h to m/s:
1 km/h = (1000 m / 3600 s) m/s
u = 72 km/h * (1000 m / 3600 s) = 20 m/s
Now we can calculate the final velocity:
v = u + at = 20 m/s + (2 m/s^2 * 5 s) = 20 m/s + 10 m/s = 30 m/s
Therefore, the car's velocity after 5 seconds will be 30 m/s.