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


a

Physics & Space Science

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