Homework Help: Physics

Posted by Christopher on Thursday, August 30, 2012 at 11:59pm.

A bullet is fired from a rifle 3m above the ground level at a target 200m away. The initial velocity of the bullet is 300 m/s. How low must the center of the target be off the ground for the bullet to successfully hit it?

Physics - Elena, Friday, August 31, 2012 at 3:48am
t=s/v = 200/300 = 0.67 s.

Δy=gt²/2=9.8•0.67²/2 =2.18 m
h=H-Δy=3-2.18= 0.82 m

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