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    				| 1. | 
                                    A bullet moving with 10 m/s hits a wooden plank. The bullet stops after penetrating the plank 2 cm deep. Calculate the retardation of the bullet. | 
                            
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Answer»  :Let U is the INITIAL SPEEDV is the FINAL speeda is the retardationand s is the distance coverd by bullet.thenthere v=0a=2500 m /s^2Hopefully UNDERSTANDABLE ^-^  | 
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