Question

What is the velocity of the car at the end oh 10 seconds

Answer 1

Explanation:

Here is the simplest way Accelerating at 8 m/s^2 for 10 seconds and your velocity is 80 m/s. Because the acceleration is constant (but not otherwise), your velocity is a straight line increase - and your average speed is the sum of start and end velocities over two. 0 + 80 / 2 = 40 m/s

10 seconds at average velocity of 40 m/s takes you 400 meters.

The kinematic equations are v = u + a*t and v.av = (u + v) / 2