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Math Help - A force of (pi + 10j)

  1. #1
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    Lightbulb A force of (pi + 10j)

    i neeed to figure out the distance and the speed of the car so i need 4 and 5 that ,thank you ...thanks in advance for help !
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  2. #2
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    Quote Originally Posted by carlasader View Post
    i neeed to figure out the distance and the speed of the car so i need 4 and 5 that ,thank you ...thanks in advance for help !
    Hello,

    to #4:

    You have 2 forces which can be described by vectors:
    \overrightarrow{f_1}=\left( \begin{array}{c}p \\ 10 \end{array} \right) and \overrightarrow{f_2}=\left( \begin{array}{c}3 \\ 5 \end{array} \right)

    The resulting force can be described by: \overrightarrow{f_r}=\left( \begin{array}{c}p+3 \\ 15 \end{array} \right)

    From F = m \cdot a you know that F =2 \frac{m}{s^2} \cdot 8.5 kg = 17 N =  \left | \overrightarrow{f_r}\right|

    Thus you get:

    17^2 = (3+p)^2+15^2\ \ \Longleftrightarrow \ \ p^2+6p-55=0

    You'll get the solutions: p_1=5 \text{ or } p_2=-11
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