The muzzle velocity of a certain gun is 100 m/s. Neglecting air resistance, at the end of 1 s a bullet fired straight up into the air will have traveled a distance of about
A)(100 - 5)m.
B)(100 + 5)m.
C)100 m.
D)5 m.
E)none of the above

Question

Quizplus · Accepted Answer

The bullet will have traveled approximately (100 - 5)m in 1 second. This is because the initial velocity is 100 m/s, and it will decelerate due to gravity (approximately 9.8 m/s^2, rounded to 10 m/s^2 for simplicity). Thus, after 1 second, the bullet's velocity will have decreased by about 10 m/s, making the average velocity over that second 95 m/s (100 m/s initial velocity - 5 m/s deceleration). Therefore, the distance traveled is roughly 95 m, which is closest to the option (100 - 5)m.

The Muzzle Velocity of a Certain Gun Is 100 M/s