anonymous
  • anonymous
Last question: A rock is thrown downward from an unknown height above the ground with an initial speed of 10 m/s. It strikes the ground 3.0 s later. Determine the initial height of the rock above the ground. Question 8 options: 1) 44 m 2) 14 m 3) 74 m 4) 30 m 5) 60 m
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
I only have 2 min left on the clock
anonymous
  • anonymous
I thought it would be (-10)(3.0)-1/2(9.8)(4.0) = 49
anonymous
  • anonymous
but thats not an option

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TuringTest
  • TuringTest
\[h=v_0t+\frac1 2at^2\]because we have defined down as positive here and it was thrown down initially
TuringTest
  • TuringTest
a=g=9.8
TuringTest
  • TuringTest
\[h=v_0t+\frac1 2gt^2=10*3+\frac1 29.8*3^2\approx?\]
anonymous
  • anonymous
74.1?
TuringTest
  • TuringTest
\[h=v_0t+\frac1 2gt^2=10*3+\frac1 29.8*3^2\approx74\]yep
anonymous
  • anonymous
Ah, that makes sense, Thanks man
TuringTest
  • TuringTest
no prob :D

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