posted by Rachel .
A rifle is aimed horizontally at a target 31 m away. The bullet hits the target 1.3 cm below the aiming point. Neglect air resistance.
(a) What is the bullet's time of flight?
(b) What is its muzzle velocity?
m/s (in the bullet's initial horizontal direction)
a. d = 0.5g*t^2 = 0.013 m.
4.9t^2 = 0.013t^2
t^2 = 0.00265
Tf = 0.052 s. = Fall time or time in flight.
b. Xo * T = 31 m.
0.052Xo = 31
Xo = 602 m/s.