You press and hold on the cart to get in
By getting near to it and pressing the "ride" button.
you mine stone with a pickaxe
you mine it Einstein
In pocket edition you'll need iron, gold or a diamond pickaxe.
you are a nerd if you play minecraft...
an iron pickaxe will do.
No there's no minecart in pe I hate that
you have to dig it up with a iron picaxe