How can I draw velocity vector diagrams?
Easiest way is to explain with a diagram. See below
Assume a car is travelling North at 100km/hr. It then turns E and continues at a reduced speed of 50km/hr .
Question: what is the resultant velocity?
You would have a vector diagram like "A"
Consider a mre involved route. The car goes N, then goes 10 deg E at 50km/hr, then turn E at 70km/hr, then turns N 50 deg E. at 35km/hr
The resultantant velocity vector is "B"
Always remeber velocity has a magnitude value and a direction value.