anonymous
  • anonymous
An object is dropped from the top of a 100-m tower. its height above ground after t sec is 100-4.9t^2 m. How fast is it falling 2 sec after it is dropped?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Well, the initial height here is 100, and the position equation you have is \[100-4.9t^2 \] and the time given is t=2 seconds, so in this case you just substitute 2 in your equation for t and there's your answer.
anonymous
  • anonymous
plug 2 in for t
anonymous
  • anonymous
That only gives me the height above ground after 2 seconds. I need to know how fast it is falling at that point.

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anonymous
  • anonymous
Oh, I misread. Have you taken yet?
anonymous
  • anonymous
taken calculus*
anonymous
  • anonymous
That's what I'm working on now. In my book, the answer is 19.6 m/s, but I keep getting -19.6 m/s.
anonymous
  • anonymous
Yeah when I work it out I also get -19.6 so either we're making the same mistake or the book has a typo. From a physics standpoint a negative velocity makes more sense to me because of the downward direction but I haven't taken either physics or calculus for a while so I might be rusty. Sorry
anonymous
  • anonymous
No problem. Thanks for the help.
goformit100
  • goformit100
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