posted by Kyle .
Annie is walking to school leisurely at a speed of 1.0 m/s for the first half of her trip. She then remembers that her physics teacher told her that she must average 2.5 m/s to make it to school on time. Realizing she might be late, she starts running. However, after a quick calculation, she stops running--she's going to be late anyways.
a) show why she can't make it on time
If she completed the second half of her distance in zero time, her average speed would be 2 m/s, which is not fast enough.