A bullet going with speed 16 m/s enters a concrete wall and penetrates a distance of 0.4 m before coming to rest. Then the time taken during the retardation is ………… × 10 –2 s. (in sec)
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Ans. 5
Sol.0 = 16 2 – 2a s ( v 2 = u 2 + 2as)
a = 
= 320 m/s 2
t = 
= 
= 5 × 10 –2 s
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