A bullet moving with velocity of 10m/s strikes a wooden plank. It penetrates to a plank to a depth of 4cm coming to stop. Calculate the average retardation of the bullet passing through the plank.
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u=10 m/s s=4 cm v=0
v square -u square=2as
0-100=2 a^4
-100=8 a
a=-12.5
v square -u square=2as
0-100=2 a^4
-100=8 a
a=-12.5
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