There are some really important things to note in this diagram. First, the force is only in the y-direction. This means that the red ball's x-motion does not change and neither does the blue ball's.

In this diagram there are two forces, which, when added together give a resultant force of 30 newtons (N). Resultant force = 20 N + 10 N Resultant force = 30 N to the right ...

Shima begins by defining the question as in the diagram above. The problem, of course, is that Tarzan’s horizontal velocity reaches a maximum when the rope is at the bottom of its swing, at 0 ...

In this diagram there are two forces, which, when added together give a resultant force of 30 newtons (N). Resultant force = 20 N + 10 N Resultant force = 30 N to the right ...