Question

A rifle bullet with a mass of 12.0 g traveling toward the right at 260 m/s strikes a large bag of sand and penetrates it to a depth of 23.0 cm. Determine the magnitude and direction of the friction force

Answer 1

for the bullet,
initial energy = Kinetic
final energy = 0
where is energy lost? ---> Work by friction in penetrating the bag.

\[F_fd={1\over2}mv^2\]
you have v, m, and d
find \(F_f\)