In a Ballistics Test,a 28-G Bullet Pierces a Sand Bag $30 \mathrm {~cm}$

In a ballistics test,a 28-g bullet pierces a sand bag that is $30 \mathrm {~cm}$ thick.If the initial bullet velocity was $55 \mathrm {~m} / \mathrm { s }$ and it emerged from the sandbag moving at $18 \mathrm {~m} / \mathrm { s } \text {, }$ what was the magnitude of the friction force (assuming it to be constant) that the bullet experienced while it traveled through the bag?

A) 130 N
B) 38 N
C) 13 N
D) 1.3 N

Correct Answer:

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