It is not only moving objects whose speed can vary. The speed of the wind and the speed of sound also vary. A typical value for the speed of sound in air is about 330 m/s.

Velocity-time graphs show velocity on the vertical axis. Acceleration is still represented by the gradient. Key fact The gradient of speed-time and velocity-time graphs represent acceleration.

Visually, if you make a plot of ω(t) vs. t, then α(t ... in the counter clockwise sense with a constant angular speed of ω AB. In summary, you should never assume that a zero value for angular ...