Do we need to test if objects B and C collide in Figure $4\mathrm{.}2\mathrm{.}10$ of the textbook?

How many objects per grid are allowed, if the size of the grid is SQRT$($N$)$ x SQRT$($N$)?$

What is the time complexity of quicksort? What is the time complexity of bubblesort? Why is bubblesort preferred over quicksort in a plane sweep?

Define collision normal.

Draw the Minkowski sum of a circle and triangle.