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Homework Statement
I don't understand how to form an equation using the knowledge that, 'When ##t=4##, ##P## is moving parallel to the vector ##\mathbf {j}##'. I've seen the solution, and not a single part of it makes sense. I haven't attempted any question like this before, so I have no idea where to even start.
What I do know is how the whole integration/ differentiation process works to get between displacement, velocity and acceleration. That's only with normal equations though, not ##\mathbf {i}## and ##\mathbf {j}## components. So, I don't see any of what I do know already helping me here. Any help would be appreciated.
Homework Equations
The Attempt at a Solution
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