A 25-g bullet traveling 300 m/s 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 average deceleration of the bullet while it was penetrating through the textbook? (B) What was the average resistive force exerted on the bullet while it was penetrating through the textbook?
In the textbook; Initial velocity 300m/s, final velocity 40
acceleration=change velocity/time
avg velocity in book=170m/s
time in book=distance/avgveloctiy=.035/170 sec
b. force= mass*acceleration=.025*acceleration in a)