Question
The velocity of an object moving along the \( x \)-axis is \( v(t)=t^{2}-14 t+45 \). The initial position is the origin. What are the two times the object is at rest? [? ] and [ ] Enter the smallest first.
Ask by O'Quinn Paul. in the United States
Mar 12,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
The object is at rest at times 5 and 9.
Solution
To find the times when the object is at rest, we need to find the values of \( t \) for which the velocity \( v(t) \) is equal to zero.
Given:
\[ v(t) = t^{2} - 14t + 45 \]
To find the times when the object is at rest, we set \( v(t) = 0 \) and solve for \( t \).
\[ t^{2} - 14t + 45 = 0 \]
Now, we can solve this quadratic equation to find the values of \( t \) when the object is at rest.
Solve the quadratic equation by following steps:
- step0: Solve by factoring:
\(t^{2}-14t+45=0\)
- step1: Factor the expression:
\(\left(t-9\right)\left(t-5\right)=0\)
- step2: Separate into possible cases:
\(\begin{align}&t-9=0\\&t-5=0\end{align}\)
- step3: Solve the equation:
\(\begin{align}&t=9\\&t=5\end{align}\)
- step4: Rewrite:
\(t_{1}=5,t_{2}=9\)
The object is at rest at times \( t = 5 \) and \( t = 9 \).
Therefore, the two times the object is at rest are 5 and 9.
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Beyond the Answer
To find when the object is at rest, we need to set the velocity function \( v(t) = t^2 - 14t + 45 \) to zero and solve for \( t \). Factoring the quadratic, we rearrange it as: \[ (t - 9)(t - 5) = 0 \] This gives us the two times the object is at rest as \( t = 5 \) and \( t = 9 \). So, the object is at rest at \( [5] \) and \( [9] \), with the smallest time being 5.