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Old Jan 17th 2018, 11:12 AM   #1
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Join Date: Jan 2018
Posts: 4
2.38 throw a glob of puddy straight up

you throw a glob of puddy straight up toward the ceiling.
which is 3.00 m above the point where the puddy leaves your hand.
the initial speed of the putty as it leaves your hand is 9.70 m/s
a. What is the speed of the puddy just before it strikes the ceilng?
\begin{align*}\displaystyle
V_f^2 &= V_0^2 + 2ad \\
&=(9.7)^2 + 2(-9.8)(3)\\
&= 94.9-58.8\\
&= 36.1\\
V_f&\approx\color{red}{6 m/s}
\end{align*}
b, How much time from when it leaves your and does it take the puddy to reach the ceiling?
\begin{align*}\displaystyle
(6-9.7)/t&=-9.8\\
-3.7t&=-9.8\\
t&=\frac{-9.8}{-3.7}\\
t&\approx\color{red}{2.65s}
\end{align*}

just seeing if this is correct
and suggestions

Last edited by countdown; Jan 17th 2018 at 11:18 AM.
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Old Jan 17th 2018, 09:32 PM   #2
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Join Date: Apr 2017
Posts: 409
First question what is puddy ...??? a search brings up "David Puddy" , and this ...

"Female genitalia or the acquiescence of female sexual company. Slang for "*****"..."

Hmmmmm ... perhaps you mean putty sometimes used in fixing windows ...

Answer (a) looks OK ...

(b) ...initial velocity is 9.7 ....final velocity 6 .... so Average velocity is 7.85 m/sec

Should take less than half a second to travel 3 meters
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