A wombat runs south in a straight line with an average velocity of 5 m/s for 4 minutes and then with an average velocity of 4 m/s for 3 minutes in the same
direction.
What is the wombats total displacement?
What is the average velocity during that time?

We have that

The wombats total displacement is

The average velocity during that time is

From the question we are told that:

initial Velocity

initial Time

Final Velocity

Final time  

a)

Generally, the equation for displacement is mathematically given by

d_t=(Initial +final) displacement

Where

initial displacement

Final displacement

Therefore

b)

Generally, the equation for Average velocity is mathematically given by

in conclusion

The wombats total displacement is

The average velocity during that time is

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it is a negative acceleration