A 61-G Bullet Has a Velocity of 475 M/s When It

Multiple Choice

A 6.1-g bullet has a velocity of 475 m/s when it penetrates a wooden door to a depth of 3.5 cm.Assuming the frictional force that stops the bullet is constant,how long does it take from the time the bullet hits the door till it comes to a stop?

A) 1.5E-4 s
B) 7.4E-5 s
C) 4.5E-2 s
D) 3.7E-3 s