The velocity is:

So the initial velocity is:

You should be able to do d. yourself.d. when and where velocity = 0

e. average velocity in the first 5s

f. average speed in the first 5s

e. The average velocity in the first 5 seconds is the change in position

in those five seconds divided by 5, so:

f. The average speed is the average of |v| over the interval.

RonL