The function models the time, t, in seconds that an object has been falling after the object has fallen d feet. When will the time be more than 1 minute?

d ≥ 16 ft
d ≥ 225 ft
d ≥ 3,600 ft
d 57,600 ft

Question

The function models the time, t, in seconds that an object has been falling after the object has fallen d feet. When will the time be more than 1 minute?  

d ≥ 16 ft
d ≥ 225 ft
d ≥ 3,600 ft
d > 57,600 ft

anonymous · Answer

attachment

anonymous · Answer

Hey, for this.. can you just plug in the different distance and see when t = 60 sec. That's 1 min after the  object starts falling.

anonymous · Answer

And when i plugged int he last option (57,600ft), I got 60 secs (aka 1 min).

anonymous · Answer

i think it's the thrid one am i right?

anonymous · Answer

No, when I did that, I got 15 secs. So at 15 secs, the object has fallen a distance of 3600 ft. However, at exactly one min, the distance the object fell is 57,600 ft.

anonymous · Answer

You can always plug in to your calc to make sure :)

anonymous · Answer

so i guess it would have to be the last one right?

anonymous · Answer

$$\sqrt{57600/16}$$

anonymous · Answer

Yeah.

anonymous · Answer

ok, thanks