Drop Ball in Car in Abaqus

Sometimes when you park your car next to the stadium, a ball may fall on your car, so I simulated it in Abaqus. I do some steps to simulate it 

1- I make a model of ball as rigid discrete then I import a model of car as deformable
2- I add the Material of the car as 
Aluminum

*Density 2.5e-09,

*Elastic 70000., 0.3

*Plastic
250., 0.
300., 0.1
3- I make an assembly of the model
4- I add  INTERACTION PROPERTIES 

*Friction
0.2,
*Surface Behavior, pressure-overclosure=HARD

5- I create a step 

*Dynamic, Explicit
, 0.1

6- I add BOUNDARY CONDITIONS in the model Symmetry/Antisymmetric 
Boundary and Predefined Field as Velocity.

7- I make the mesh and create a job 

Finally , this is the result