a) Average velocity: 2.8 m/s
b) Average velocity: 5.2 m/s
c) Average velocity: 7.6 m/s
Explanation:
a)
The position of the car as a function of time t is given by

where


The average velocity is given by the ratio between the displacement and the time taken:

The position at t = 0 is:

The position at t = 2.00 s is:

So the displacement is

The time interval is

And so, the average velocity in this interval is

b)
The position at t = 0 is:

While the position at t = 4.00 s is:

So the displacement is

The time interval is

So the average velocity here is

c)
The position at t = 2 s is:

While the position at t = 4 s is:

So the displacement is

While the time interval is

So the average velocity is

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