unity3d - Objects not colliding in 2D project -

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i've set 2d project in unity (4.3.4). has ball , ground. ball in air.

to ball i've added box collider 2d , rigidbody 2d, standard values.

to ground i've added box collider 2d.

when run game, ball falls, instead of stopping when hitting ground, continues , keep falling.

where did go wrong? tutorials should work?

check if 1 of 2 colliders has checkbox istrigger checked. should both unchecked collisions work. first time happened me took me whole day figure out xd


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