jessicasanchez78 jessicasanchez78
  • 01-11-2018
  • Physics
contestada

if an object starting from rest falls 5.7 seconds how far does it fall

Respuesta :

elbunt
elbunt elbunt
  • 01-11-2018
Kinematic question!
Start with your knowns!

[tex]t = 5.7s \\ v0 = 0 \frac{m}{s} \\ a = - 9.8 \frac{m}{ {s}^{2} } [/tex]
we want to find x!

the only kineamtic that works with this info is the third!
[tex]x = v0 \times t + \frac{1}{2} \times a \times {t}^{2} [/tex]
so we plug in our values and get
[tex]x = 0 + \frac{1}{2} \times ( - 9.8 \frac{m}{ {s}^{2} } ) \times ( {(5.7s)}^{2} )[/tex]
this'll equal out to -159.2 meters.

our units equal out, so we know our answer is correct!
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