- #1
Glyper
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Homework Statement
A marble fell from the height h and covered the last 196,2m in 4 seconds. How long was the marble falling? What height was it falling from?
Homework Equations
[itex]s=s_{0}+v_{0}t+\frac{at^{2}}{2}[/itex]
[itex]v(t) = v_0 + at[/itex]
The Attempt at a Solution
In the first equation above, we can plug what we know, obtaining: [itex]196,2=v_{0}\cdot4+\frac{9,81\cdot4^{2}}{2}=4v_{0}+78,48[/itex] so [itex]v_0 \approx 29,4m/s[/itex]. We can plug it into the second obtaining [itex]v(4)=29,4+9,81\cdot4=68,64m/s[/itex]. What does it give me, though? How should I progress?