posted by Jon on .
9)You are taking a road trip to the beach for Spring Break. You leave at 12:00pm. At 12:10 you stop for lunch 10 miles down the road. You get back on the road and travel 75 more miles and realize that you need to stop for gas. You notice that it is now 1:10pm. At this point in the trip, what is your average velocity in miles per hour?
10)An airplane must achieve a velocity of 71 m/s to takeoff. If the runway is 1000m long, at what speed must the plane constantly accelerate?
Checking your answer for 10:
For an initial velocity of 0, final velocity can be expressed as:
V = SQRT(2 * acceleration * distance)
Using your answer of 0.071 m/s:
V = SQRT(2 * (0.071 m/s^2) * 1000m)
V = SQRT( 142.0 m^2/s^2)
V = 11.92 m/s
Uh-oh! Not enough velocity by the end of the runway!
2.52 for #10
2.52 m/s^2 is what I got also.