you have final velocity, but not starting velocity. Cant be determined.
If you had starting velociy, you could have
avgforce*time=massllet(vi-vf)
and the time is distance/avg velocity
avgvelocity=(vf+vi)/2
so you have resistive force.
for acceleration, a=avgvorce/massbullet
There are other ways, but you need the initial velocity.
A 25-kg bullet traveling shoots into a physics textbook that is 3.5 cm wide, and exits the textbook traveling 40 m/s. Poor defenseless textbook! (A) What was the magnitude of the average deceleration of the bullet while it was penetrating through the textbook? (B) What was the magnitude of the average resistive force exerted on the bullet while it was penetrating through the textbook?
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