A bullet is fired from a rifle, so that its position, in metres, at time t seconds is given by

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A bullet is fired from a rifle, so that its position, in metres, at time t seconds is given by

[From: ] [author: ] [Date: 11-11-24] [Hit: ]

instead, it needs to be the vertical component (j) because when j=0, thats when it hits the ground.solve this and youll get t=.1.225-4.......

r=180t(i) + (1.225-4.9t^2)(j)

b)Find the time when the bullet hits the ground
I tried to make r=0 and work it out like a quadratic equation but that gives complex roots, and the answer is supposed to be 0.5s

please explain in steps
thank you

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setting something to 0 is the right idea, but you don't set r=0. instead, it needs to be the vertical component (j) because when j=0, that's when it hits the ground.

solve this and you'll get t=.5:
1.225-4.9t^2=0

1

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