A rifle is aimed horizontally at a target 100 m away. When the fired bullet stri

Question

A rifle is aimed horizontally at a target 100 m away. When the fired bullet strikes the target it is 1.5 cm below the aimpoint. a) What was the bullet's flight time? b) What was the bullet's velocity as it left the rifle barrel? c) What was the bullet's velocity just before it struck the target? A rifle is aimed horizontally at a target 100 m away. When the fired bullet strikes the target it is 1.5 cm below the aimpoint. a) What was the bullet's flight time? b) What was the bullet's velocity as it left the rifle barrel? c) What was the bullet's velocity just before it struck the target? A rifle is aimed horizontally at a target 100 m away. When the fired bullet strikes the target it is 1.5 cm below the aimpoint. a) What was the bullet's flight time? b) What was the bullet's velocity as it left the rifle barrel? c) What was the bullet's velocity just before it struck the target?

Explanation / Answer

(a)

1.5 cm = 0.015 m
0.015 = ½ gt2
0.015/4.9 = t2

t = 0.05532 secs

(b)

For V0 = S/t

V0 = 100 m / 0.05532 = 1807.4 m/s

(c)

Vy = v0 sin

is ~0, however sin = 0.015/100 = 0.00015

therefore vy = 0.00473 m/s

so consider vy = 0 m/s

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