Posted by **Soly** on Monday, September 3, 2007 at 11:25pm.

Could you please check my work and help me with two of the problems.

An airplane that flies at 100 km/h with a 10 km/h tailwind travels at 110 km/h relative to the ground. If it instead flies into a 10 km/h headwind, its groundspeed is

100km/h-10km/h = 90 km/h

The average speed of a horse that gallops a distance of 10 kilometers in a time of 30 minutes is? (This one I don't understand, I know the formula to find average speed is is average speed= distance traveled/time of travel)

What is the acceleration of a car that maintains a constant velocity of 100 km/hr for 10 seconds? (For this one don't I have to get the same units, this is how I started, but not too sure where to go afterward: (100 km/hr)(1000 km/hr)(1/3600 s)= 27.8 m/s)

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