In a Ballistics Test, a 28-G Bullet Pierces a Sand

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

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

Correct Answer:

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