when i lift up the object and leave it from certain distance .when it falls down it overlap with another object. and get stuck overthere it self only i have tried many times but i am getting same problems.What should i do ? Anythere to help please.
Change the collision settings in the editor of your collider.
Check out this answers for further information about how Unity calculates the collisions. It may happen that your rigidbody is too fast for the setting you are using.