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 Interactive Checkpoint
 Velocity:  Speed or the distance an object travels divided by the time it took to make the trip.

Answer the following questions about velocity.
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Graded Response
a) A car travels 220 miles in 5 hours. What was the car's average velocity in miles per hour (mph)? a) mph

b) The vertical height (in feet) of an elevator as a function of time (in seconds) is represented by the equation

h = -5t + 145

How fast does the vertical height change, in feet per second?

b) fps

c) What direction is the elevator moving in part b?

c)

d) The vertical position, h, in meters, of a fly ball as a function of time, t, in seconds, is approximated by the equation

h = -5t2 + 20t + 2

After how many seconds will the ball not be moving for an instant?

d) sec