A bullet moving with velocity of 10m/s strikes a wooden plank. It penetrates to a plank to a depth of 35cm coming to stop. Calculate the average retardation of the bullet passing through the plank.
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u= 10m/s
v=0m/s( object came to rest)
distance=35 cm=35/100m= 7/20m
2as=v^2-u^2
2a*7/20=0-100
a*7/10=-100
a= -100*10/7
a= -1000/7
a= -142.8m/s^2
when acc. is in opposite direction or it is negative then it is called retardation
v=0m/s( object came to rest)
distance=35 cm=35/100m= 7/20m
2as=v^2-u^2
2a*7/20=0-100
a*7/10=-100
a= -100*10/7
a= -1000/7
a= -142.8m/s^2
when acc. is in opposite direction or it is negative then it is called retardation
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