An 8 g bullet leaves the muzzle of a rifle with
a speed of 611.9 m/s.
what constant force is exerted on the bullet
while it is traveling down the 0.8 m length of
the barrel of the rifle?
answer in units of n.

1872 N

Explanation:

This problem can be solved by using one of the Kinematics equations and Newton's second law of motion:

(1)

(2)

Where:

is the bullet's final speed (when it leaves the muzzle)

is the bullet's initial speed (at rest)

is the bullet's acceleration

is the distance traveled by the bullet before leaving the muzzle

is the force

is the mass of the bullet

Knowing this, let's begin by isolating from (1):

(3)

(4)

(5)

Substituting (5) in (2):

(6)

Finally:

answer: a ball

explanation: because it will bounce