The distance between New York City and Washington, D.C is 245 miles. If you drive half of the distance at 50.0 miles per hour and the other half at 65.0 miles per hour, what is your average speed during the entire trip?
A small airplane needs to reach a speed of 280 km/h to take off. (a). What is the minimum length of a runway in m that can allow the plane to takeoff if it accelerates at the rate of 3.80 m/s2? (b) How much time does the plane take to reach that speed from rest?