I am trying to start up my iPad 2010 it won’t start up ?

Connect your iPad to its Power Adapter and allow the iPad to charge, undisturbed, for at least an hour - or,if necessary overnight. Then, while still connected to external power, try a forced-restart:

• On an iPad with a Home button: Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.
• On other iPad models: Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the top button. When the Apple logo appears, release the button.

Note:  If iPad still doesn’t turn on, or if it gets stuck during start up, see the Apple Support article If your iPhone, iPad, or iPod touch won’t turn on or is frozen. Or if your iPad isn’t working correctly after you restart it, see the iPad Support website.

If you continue to experience difficulties, you will need to seek assistance directly from from Apple Support. You can contact the Support Team using the Get Support link at top-right of this page. Alternatively, you can initiate and manage your support cases using the excellent Apple Support App. If not already installed on your iPad, the App can be downloaded from the App Store:

https://apps.apple.com/gb/app/apple-support/id1130498044

You might also visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your iPad:

Genius Bar Reservation and Apple Support Options - Apple

The symptoms that you describe suggest a failing battery - and you may be able to narrow the possibilities.

Assuming that the iPad is still running, whilst monitoring the battery state, disconnect the Power Adapter. Does the reported battery state suddenly fall, or the iPad immediately power-off? If so, your battery has either reach the end of is useful life and/or is failing. 

If the iPad remains running, you would be well advised to directly contact Apple Support using the Get Support link at top-right of this page - and request a remote battery test; the results of this test may better inform your next steps - and the economic viability of a battery replacement.

If may well be useful to take your iPad, Power Adapter and charging cable along to the Genius Bar at your local Apple Store - where the technicians will be able to test and assess your iPad (and its battery), your Power Adapter and cable(s):

Genius Bar Reservation and Apple Support Options - Apple

I hope this guidance proves to be helpful with troubleshooting the problem.