Now...
Improving Megumi’s
Serve
the relationship
betwn the
change of
momentum and
impulse.
Yes,
I hope you
understand
this.
That means I can
aly it to my
teis game!
Reca how
we examined the
momentum of a
stroke.
Yes!
Given the importance
of changing a ba’s
momentum, I want
to find out a beer
way to serve!
I s.
Here she
goes!
The fatal service
of Megumi Ninomiya
that could smash
an elephant!
Is that
reay the
kind of serve
you want to
deliver?
G
We, if that’s the
case, we should talk
with Sayaka. You two
are evenly matched
and sm to have
the same physical
strength.
But Koda-san was
using the spring of
her body while she
served. Her serve is
much more powerful
Are you saying
I’m not as gd
as Sayaka?
I just mean that’s
one area to
improve. Yeow!
A right then. I’
examine my serve
in the context of
mechanics.
We, we know that
change in momentum
equals force multiplied
by time, so one idea for
is to impose a
force on the ba
for as long as
poible.
We’re often
told to hit the
ba with a our
might!
Sounds
gd to me.
Pu
pu
pu
That way, youre
increasing the
duration of
contact betwn
ba and racket.
Simply using the
same force over a
greater time wi
result in a faster
serve.
I s. Do you
have any other
hints?
An obvious way to
increase the change
in momentum is to
increase the force
you aly.
Reay?!
At dierent points
exerting dierent
amounts of force.
Oh, I didnt
realize that.
serving the ba
is very wasteful,
Ninomiya-san.
serve
You’re hiing
the ba t
early—lk at
these images
Improving Megumi’s Serve 135
So, by making your
body more flexible
and hiing the ba at
the right time, you can
maximize the force you
exert on the ba and
the duration of impact.
Flexible, eh...
Just waiting a
bit longer to
strike the ba
could help
a lot.
Of course, teis
is a complicated
game, and we
can’t represent
everything so
simply...
Sti, the
principle of
change in
momentum = impulse
explains how the
ba moves.
Yeah.
And despite the
physics involved, you
sti have to kp
during the game...
Hit the ba like an
try to extend the
time of impact. This
is why you should
“foow through
Then the
impulse
increases!
136 Chapter 3 Momentum
In my case, I don’t
think I have the
crdination to do
this. But I think you can,
Ninomiya-san...
It’s nice to hear
that! Thank you...
Ryota!
Ryo—what? You…
what on earth, a
of a suen?
You must be
angling for
something
again!!!
No, no, it’s
not that!
Dont you think it’s
time we start caing
each other by our
first names?
You can ca
me Megumi,
you know.
That’s t
much for me.
Come on!
Dont be so
square.
Edging
away

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