Originally Posted by

**Th3On3Fr33man** First of all, would this work for average velocity for this:

The height of Heather's calculus book t seconds after she drops it from the top of the 500-meter-tall building is s(t)=-4.9t^2+500.

a. Find the average velocity of the object during the first 3 seconds.

b. Use the Mean Value Theorem to verify that at some time during the first 3 seconds of fall the instantaneous velocity equals the average velocity. Find that time.

s(t)=-4.9t^2+500,

-4.9(3)^2+500=455.9,

500-455.9=44.1

a. Vav= displacement/time=44.1/3=14.7?

and then I don't get B...