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If a vector that is 1cm long represents a velocity of 10km/h, what velocity does a vector 2cm long drawn to the same scale represent?

An airplane has an airspeed of 100km/h north. If there is a 30 km/h tailwind, what is its groundspeed?

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1. V = 2 * 10km/h = 20km/h.

2. V = 100km/h + 30km/h = 130km.

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