A train starts from rest (at position zero) and moves with constant acceleration. On the first observation, its velocity is 20m/s and 80seconds later the velocity became 60m/s. At 80s calculate the position, average velocity, and the constant acceleration over the interval.(7-points)

The value of the acceleration is a = 0.5 m/s². The position at 80 s is x = 3200 m and finally the average velocity is v = 40 m/s.

Acceleration:

We can use the fallowing kinematic equation to get the acceleration at 80 s.

Where:

The, we have:

Position:

Knowing the acceleration we can find the position using the falling equation.

Average velocity:

The definition of the average velocity is:

Learn more about the kinematic equations here:

I hope it helps you!

the answer is kevlar

0.19 m/s and 0.45 m/s