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First we can reset your iPad and see if it works or not. Press and hold down the Power button and Home button at the same time until it shows the Apple logo. When you see the Apple logo, release the buttons and let it boot.
Once you did that, go to Settings select Safari. Tap Clear History and Website Data button. Close it. Open Safari and see if it is working or not
Please let me know if that didn't work, so we can continue troubleshooting.