Amateur Learn Platform Diving 10, Amateur Learn Platform Diving

1.Climb to the jumping platform.

2.Walk to the stage.

3.Close your eyes.

4.Recite ten times of Buddha, God, or other 4Jump off.

ps: If you don't have the conditions to jump on the platform, you can also jump into the river by the bridge that is not too high, good luck!

According to the title: 10+

5, finishing, get 5t2

i.e. t2t-1=0

Solve t1, t2

Round, so the athlete has a maximum of time to complete the specified action Click: substitute h=5 into the relationship between h and t, and find the value of t

Solution: According to the topic: 10+

I tidy it up and get it. Omit x1 approximately equals and x2 approximately equals.

But x2 doesn't fit the topic, so there is seconds.

To be done within 5 meters.

h 55 = 10 + squared.

5t squared + bring in**.

t=from 1 to 6

Get 2 t 3

Then column **.

From to then t is approximately equal to.

The teacher just assigned this question today).

This is a simple mathematical modeling problem.

According to the title, h represents the height above the water.

In fact, it is the height of the athlete from the water surface when he completes the somersault with the change of time t.

It is said that "the athlete must complete the movement before 5 meters above the water surface", which means that the movement must be completed at h>=5. From the expression of h, it can be seen that h increases first and then decreases with the increase of t, and when t < 1 4, h increases with the increase of t, and when t>=1 4, h decreases with the increase of t, so when h takes 5, you can get "how long does it take to complete the prescribed action at most"!

So, h=10+>=5

5t^<=0

2t^2-t-2<=0

You can solve the equation yourself.

The final answer is that he has at most about the same amount to complete the prescribed action.

That's right, this kind of problem, this kind of irrationality, this kind of destruction, China can find a lot of it. Adopt it.

There are many kinds of diving.

There is diving diving.

Platform diving. Swim and dive.

Diving diving is generally the first foot into the water, learning is very simple, step on it OK But in the process to protect your oxygen mask from being overturned by the water.

Platform diving, the hand enters the water first, and then the head, chest, hips, and feet, and is normally planted 90 degrees downward. At this time, you must pay attention to balance, it should be easy to be unstable at the angle, so as to injure your body, and the jumping platform is generally above, if you don't have a foundation, it is easy to get injured, and it is often the back. If you add fancy, it takes a lot of effort, and I won't.

Swimming and diving is the most practical because many pools don't have jumping platforms, and swimming diving has a great acceleration effect on swimming. It's the same as the platform diving sequence, the angle of entry is different, and I usually enter the water at an angle of 30 to 45°. This accelerates the fastest, and it is easy to work with the dolphin heel.

What should be noted here is that being careful of hitting water in the chest is very painful, and choking on water can be overcome if it is generally water-based. And the head bottoms out. Shallow areas should be cautious.

And when you start training, you can go deeper and go down the edge and try to plant it at 90 degrees to overcome your fears. Later, I accelerated with the help of pedals.

(1) In a given Cartesian coordinate system, let the highest point be a, the water entry point be b, and the analytic formula of the parabola is y=ax2+bx+c

According to the inscription, the coordinates of the two points O and B are (0,0) and (2,-10) respectively, and the ordinate of vertex A is 23

So: c 0

4ac?b4a＝2

34a+2b+c＝?10

Solution. a＝?25

6b＝103c＝0

or a ?32b＝?2

c 0, the parabolic axis of symmetry is on the right side of the y-axis, -b2a

0, and the parabolic opening is downward, a 0

b＞0．a=-25

6，b=10

3，c=0．

The analytic formula for the parabola is y=--25

6x2+103x；

2) To judge whether there will be a mistake, just see whether the athlete has completed the prescribed action before the height of 5m from the water surface, so only the athlete is required to be at a horizontal distance of 33 from the pool

The ordinate at 5m is sufficient

The abscissa is: , i.e., when x=, y=(-25

5 = -163, when the athlete is 10-16 above the water

As a result, there will be a mistake in this attempt

Yes, but be sure to find a professional trainer, because diving is a dangerous sport after all.

At the age of 18, although it is very late, there is still hope, and many of these players in foreign countries only turned to the platform at this age.

It's unlikely for your age Diving starts at a young age Four or five years old is the most suitable age Diving is not that simple

It can strengthen the body and build the body.