Asked by Sara
                The force shown in the figure acts on a 1.7-kg object whose initial speed is 0.44 m/s and initial position is x = 0.27 m. 
the figure can be found at:
[[webassign dot net forwardslash walker forwardslash 07-16 dot gif]]
(a) Find the speed of the object when it is at the location x = 0.92 m.
(b) At what location would the object's speed be 0.34 m/s?
I have tried several times using W = F_1(x_1) + F_2(x_2-x_1) and then W = KE_f - KE_i to solve for the first part but keep getting the answer wrong. For the second part I have tried many different things but its all just guessing, really. Please Help!!!
            
            
        the figure can be found at:
[[webassign dot net forwardslash walker forwardslash 07-16 dot gif]]
(a) Find the speed of the object when it is at the location x = 0.92 m.
(b) At what location would the object's speed be 0.34 m/s?
I have tried several times using W = F_1(x_1) + F_2(x_2-x_1) and then W = KE_f - KE_i to solve for the first part but keep getting the answer wrong. For the second part I have tried many different things but its all just guessing, really. Please Help!!!
Answers
                    Answered by
            bobpursley
            
    find the area of the figure from x1 to x2. That area is the energy in joules added.  Then set that area to difference in KE (KEf-KEi)
use basic area under the curves (break it up into rectangles and add).
    
use basic area under the curves (break it up into rectangles and add).
                    Answered by
            Sara
            
    thanks, I've got the first part correct now.  can anybody help out a little more on the second part?  I'm still completely confused.
    
                    Answered by
            bobpursley
            
    same thing.
figure the change of KE.
Then figure the x to achieve that area.
    
figure the change of KE.
Then figure the x to achieve that area.
                    Answered by
            Siyabonga
            
    Thank you. 
    
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