Which of the following movements can be considered uniform and which are not? Why?

Which of the following movements can be considered uniform and which are not? Why? a). Falling water in a waterfall; b). Vehicle movement on the street when braking after seeing a red light; v). Rise of passengers on a subway escalator

a) Water falls under the influence of gravity with an acceleration g, so its fall is uniformly accelerated (except for the air resistance when falling).

b) When braking, the vehicle speed changes equally slowly, i.e. the speed decreases every second by the same amount.

c) The escalator usually rises evenly (to be precise, in small jerks), therefore, the movement of people on it can also be considered uniform.