why

Asked by pratibhakohli | 25th Jul, 2010, 01:00: PM

Expert Answer:

While pushing the brick gently we are applying the force over a long period of time, but when we kick it, it's for a very short peirod, during which the reaction force from brick is also received. So a large momentum is transferred from brick to us and we are hurt.
 
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Answered by  | 26th Jul, 2010, 06:51: AM

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