A rocket's velocity versus time graph is shown. Categorize its motion as one of the following:

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: C. The velocity versus time graph has a constant slope, so the acceleration is constant. The slope of the graph is approximately 40 m/s^2, so it is neither of the two special cases listed in answer B.