CBSE Class 11-science Answered
a bullet of mass 0.04 kg is moving with a speed of 90 m\sec enters a heavy wooden block and is stopp... Al questions plz
Asked by ganeshsamantaray77 | 05 Feb, 2020, 09:02: PM
Expert Answer
Answer for question No. 7 :-
If the bullet which is moving with speed 90 m/s, is stopped after passing through 60 cm in the wooden block,
then retardation a is given by, u2 = 2 a S ..........................(1)
where u is inital speed and S is the distance penatrated by bullet in the wooden block
retardation a = u2 / ( 2 S ) = ( 90 × 90 )/ ( 2 × 60 × 10-2 ) = 6750 m/s2
REsistive force = mass of bullet × retardation = 0.04 × 6750 = 270 N
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