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byerskm2
Group Title
An object is dropped from a tower of height 224 feet, subject to only the constant acceleration of −32 ft/sec2 due to gravity.
(d) What should its initial velocity be in order to strike the ground after 1 second?
 2 years ago
 2 years ago
byerskm2 Group Title
An object is dropped from a tower of height 224 feet, subject to only the constant acceleration of −32 ft/sec2 due to gravity. (d) What should its initial velocity be in order to strike the ground after 1 second?
 2 years ago
 2 years ago

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satellite73 Group TitleBest ResponseYou've already chosen the best response.1
clearly the word "dropped" here is inappropriate, since they are asking what hthe initial velocity should be if it is dropped, the initial velocity is 0!!
 2 years ago

byerskm2 Group TitleBest ResponseYou've already chosen the best response.0
http://i50.tinypic.com/34ip8a8.png
 2 years ago

byerskm2 Group TitleBest ResponseYou've already chosen the best response.0
In order to reach the ground in 1 second the Vi would have to have a negative velocity of some value otherwise it would not be fast enough
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
oh you put in the word "dropped" tsk tsk
 2 years ago

byerskm2 Group TitleBest ResponseYou've already chosen the best response.0
I just can't find the corriect value
 2 years ago

byerskm2 Group TitleBest ResponseYou've already chosen the best response.0
sorry that's what the question said
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
lets try this \[a(t)=32, v(t)=32t^2+v_0, p(t)=16t^2+v_0t+224\]
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
or more commonly written \[h(t)=16t^2+v_0t+224\]
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
set equal to zero, then put \(t=1\) to solve for \(v_0\)
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
\[t^2\frac{v_0}{16}14=0\]
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
oh no your answer will have a \(v_0\) in it
 2 years ago

byerskm2 Group TitleBest ResponseYou've already chosen the best response.0
I plugged in 1 for t and got the 208
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
oh wait, you are right put \(t=1\) set equal to 0 solve for \(v_0\)
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
\[0=16+v_0+224\] \[v_0=208\]
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
i see the problem it is negative and you put 208 i bet
 2 years ago

byerskm2 Group TitleBest ResponseYou've already chosen the best response.0
Oh! Darn. I even said it have to be negative in the beginning didn't I? X(
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
yes you did
 2 years ago

byerskm2 Group TitleBest ResponseYou've already chosen the best response.0
I plugged it in :) it's right :P thanks! I knew I had to be right but I'm always missing some stupid detail!
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.1
yw always good to have another pair of eyes
 2 years ago
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