Question

In a certain time, a ball which describe a ballistic movement has velocity equals to 25i -4,9j (The axis x is horizontal, the axis y is to up). Question: the ball already passed by the highest point of the trajectory ?

Answer 1

Yes, because it is falling and is obvious that happens once the maximum height has been reached . We know is falling because the vertical component of velocity (y-axis) is negative (downwards)

Answer 2

since the j-component is negative ,the ball is moving downwards .
which is only possible once it reaches the max. height.
so, yes it has passed the highest point of the trajectory.

Answer 3

I think this too, but, the reason that I put this question is because in the book is wrote no. I imagine that the book is wrong.

Answer 4

If maximum height has not been reached before falling, then the book will have to explain when.

Answer 5

But this is impossible, right? Any point before the falling of the ball, including the initial point of the falling, is taller, in relation of the ground, than others point after, I think...