anonymous
  • anonymous
Sandra throws an object into the air with an initial vertical velocity of 38 ft/s, from a platform that is 30 ft above the ground. How long will it take the object to hit the ground? A. 2 s B. 3 s C. 1 s D. 4 s
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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jdoe0001
  • jdoe0001
hint: \(\bf \text{initial velocity}\\ h = -16t^2+v_ot+h_o \qquad \text{in feet}\\ \\ \quad \\ v_o=\textit{initial velocity of the object}\\ h_o=\textit{initial height of the object}\\ h=\textit{height of the object at "t" seconds}\)
jdoe0001
  • jdoe0001
you're given \(bf v_o\ and \ h_o\) thus use them, plug them in keep in mind that, that the object hits the ground when y = 0
jdoe0001
  • jdoe0001
anyhow \(\bf v_o\ and \ h_o\) are given

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jdoe0001
  • jdoe0001
|dw:1437610147955:dw| thus \(\bf \text{initial velocity}\\ h = -16t^2+v_ot+h_o \qquad \text{in feet}\\ \\ \quad \\ v_o=38\\ h_o=30\\ \\ \quad \\ h = -16t^2+38t+30\qquad \textit{hits the ground}\to {\color{brown}{ 0}} = -16t^2+38t+30\)
anonymous
  • anonymous
i;m thinking B then
jdoe0001
  • jdoe0001
because?
jdoe0001
  • jdoe0001
why not just solve it for "t"?
anonymous
  • anonymous
ohhh so its A ok
anonymous
  • anonymous
no its acctually C
anonymous
  • anonymous
yes it is
anonymous
  • anonymous
C

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