A 28-g bullet pierces a sand bag that is thick. The initial speed of the bullet is 55 m/s and it emerged from the sandbag at speed 18m/s What is the average magnitude of the friction force that slowed the bullet as it traveled through the bag?

1.3 N
130 N
38 N
13 N

Question

A 28-g bullet pierces a sand bag that is  thick. The initial speed of the bullet is  55 m/s and it emerged from the sandbag at speed 18m/s  What is the average magnitude of the friction force that slowed the bullet as it traveled through the bag?  
  
 1.3 N 
 130 N 
 38 N 
 13 N

akohl · Answer

Its s 30 cm thick

abhisar · Answer

use $\large\sf v^2=u^2-2as$; Take v=18,u=55,s=30 `(convert in m frst)`

abhisar · Answer

find a

akohl · Answer

I keep getting 4501

abhisar · Answer

multiplied a with mass of bullet ?

akohl · Answer

When I multiply by mass I find friction is 126

abhisar · Answer

mass is in grams...convert in kg

abhisar · Answer

done ?

akohl · Answer

Thanks

abhisar · Answer

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