Answers

2015-08-19T18:08:09+05:30
Wall is more harder and is not compressible , so when we hit the wall our hand pains.Sponge is soft and can be easily compressed so when we hit the sponge of the seat we don't get hurt.  
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2015-08-19T19:04:52+05:30
Because wall is so hard and spunze seat of the car is soft
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