37. A projectile is launched at an angle in the air. Neglecting air resistance, what is its vertical acceleration. Its horizontal acceleration.

38. At what point in its path does a projectile have minimum speed? Explain.

39. When the ball is moving a circle, there must be _______ force acting on the ball to keep it moving in a circle. That force always acts toward the center of the circle, pulling the ball towards there.

40. What is the miminum speed at which you could swing the ball so that the string won't go slack at the top of the swing?

41. A cannon fires a shell at a fixed angle above the horizontal. Which one of the following quantities is the same throughout the shell's flight?
a. its speed
b. its acceleration
c. its velocity