Question

a bullet is travelling with velocity of 16 m/s pentrates a tree trunk and comes to rest in 0.4 find the time taken during the retardation
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Answer 1

Answer:

nitial velocity= u= 16 m/s

distance covered = S=  0.4 m

Final velocity=v= 0 m/s

the equation of motion;

v²=u²+2aS

0=16²+2 x a x 0.4

a=-16²/0.8  

a=-320 m/s

As it carries a negative sign it represent retardation.  

Time taken during the retardation is given by the equation;

v=u+at 0= 16-320 x t  

t=16/320

t=1/20

t=0.05 s

pls mrk brainliest psl psl

Explanation: