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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?
 one year ago
 one year ago
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?
 one year ago
 one year ago

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satellite73Best 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!!
 one year ago

byerskm2Best ResponseYou've already chosen the best response.0
http://i50.tinypic.com/34ip8a8.png
 one year ago

byerskm2Best 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
 one year ago

satellite73Best ResponseYou've already chosen the best response.1
oh you put in the word "dropped" tsk tsk
 one year ago

byerskm2Best ResponseYou've already chosen the best response.0
I just can't find the corriect value
 one year ago

byerskm2Best ResponseYou've already chosen the best response.0
sorry that's what the question said
 one year ago

satellite73Best ResponseYou've already chosen the best response.1
lets try this \[a(t)=32, v(t)=32t^2+v_0, p(t)=16t^2+v_0t+224\]
 one year ago

satellite73Best ResponseYou've already chosen the best response.1
or more commonly written \[h(t)=16t^2+v_0t+224\]
 one year ago

satellite73Best ResponseYou've already chosen the best response.1
set equal to zero, then put \(t=1\) to solve for \(v_0\)
 one year ago

satellite73Best ResponseYou've already chosen the best response.1
\[t^2\frac{v_0}{16}14=0\]
 one year ago

satellite73Best ResponseYou've already chosen the best response.1
oh no your answer will have a \(v_0\) in it
 one year ago

byerskm2Best ResponseYou've already chosen the best response.0
I plugged in 1 for t and got the 208
 one year ago

satellite73Best ResponseYou've already chosen the best response.1
oh wait, you are right put \(t=1\) set equal to 0 solve for \(v_0\)
 one year ago

satellite73Best ResponseYou've already chosen the best response.1
\[0=16+v_0+224\] \[v_0=208\]
 one year ago

satellite73Best ResponseYou've already chosen the best response.1
i see the problem it is negative and you put 208 i bet
 one year ago

byerskm2Best 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(
 one year ago

byerskm2Best 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!
 one year ago

satellite73Best ResponseYou've already chosen the best response.1
yw always good to have another pair of eyes
 one year ago
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