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vova2212 [387]
3 years ago
7

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

Physics
1 answer:
White raven [17]3 years ago
5 0
Kinematic question!
Start with your knowns!

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

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

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