A metal ball is thrown straight up. Categorize its motion from the time of release to just before impact with the ground.

A) Constant velocity (zero acceleration), also known as "sixth grade kinematics".

B) Constant acceleration of magnitude g or g*sin(theta)

C) Constant acceleration of some other value

D) Changing acceleration of two or more discreet values.

E) Continuously changing acceleration

Solution: B. The ball has a constant downward acceleration of magnitude g.