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Active Calculus - Multivariable

Activity 10.2.4.
Suppose a moving object in space has its velocity given by
\begin{equation*} \vv(t) = (-2\sin(2t)) \vi + (2 \cos(t)) \vj + \left(1 - \frac{1}{1+t}\right) \vk\text{.} \end{equation*}
A graph of the position of the object for times \(t\) in \([-0.5,3]\) is shown in Figure 10.2.9. Suppose further that the object is at the point \((1.5,-1,0)\) at time \(t=0\text{.}\)
(a)
Determine \(\va(t)\text{,}\) the acceleration of the object at time \(t\text{.}\)
(b)
Determine \(\vr(t)\text{,}\) position of the object at time \(t\text{.}\)
(c)
Compute the position, velocity, and acceleration vectors of the object at time \(t=1\) and plot these vectors using Figure 10.2.9.
Figure 10.2.9. The position graph for the function in Activity 10.2.4
(d)
Give the vector equation for the tangent line, \(\vL(t)\text{,}\) that is tangent to the graph of \(\vr(t)\) at \(t = 1\text{.}\)