HP 39gs Master Manual page 106

Suppose you had the problem:
"What acceleration is needed to increase the speed of a car from 16 67 m/s (60kph
or ~38mph) to 27 78 m/s (100kph or 60mph) in a distance of 100m (~110 yd)?"
We'll assume that you have already entered the equation into
ed.
Solving for a missing value
If you press to change to the
NUM
similar to the screen on the right. What values are showing on your
screen will depend on what happens to be in the memories
at the time. Pressing
D
Move the highlight to
V
100.
Now move the highlight back to
press the button. You should find that you obtain the answer to
our problem of 2 47 m/s
⋅
The INFO report
When the process has finished, you can obtain a report on it by
pressing the button. The result in this case may not seem very
informative but there is more about these messages on page 106. The
information they supply can be critical and you should develop the habit
of checking them.
⋅
view, you will see something
NUM
will zero all values.
SHIFT CLEAR
⋅
and enter the value
27 78
(the value you're trying to find) and
A
.
2
(as above) and have made sure that it is
E2
, , and
V U A
, then to and enter 16 67 and finally to
U
106
⋅
and enter
⋅ D