If 3cm represents 30km/h, 5cm long vector will represent a velocity of 50km/h.
Velocity is the time rate of change of displacement. The displacement and velocity both are vector quantities. They represent magnitude and direction as well.
If 3cm represents 30km/h
1cm represents 10km/h.
5cm long vector will represent a velocity of 50km/h.
Thus, 5cm long vector will represent a velocity of 50km/h.
Learn more about velocity.
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