The flow therefore satisfies all the restrictions governing the use of Bernoulli's equation. Upstream and downstream of the contraction we make the one-dimensional assumption that the velocity is ...

A line upwards curving to become flat means that the vehicle is accelerating at a decreasing rate to constant speed. Remember, acceleration is the same as gradient, and acceleration = velocity ...

The relationship between acceleration, velocity change and the time taken for the change is given by this formula. \(\text{acceleration}=\frac{\text{change in velocity}}{\text{time taken}}=\ ...