02-11-2008
ok..
a girl scout has to sell cookies in her neighborhood. after walking out her door, she initially walks 15 meters, East, at 1m/sec. to arrivie at the first house. it takes her 180 seconds to ring the doorbell. she then walks 17meters North, at 1m/sec to arrive at the next house, once more she takes another 180 seconds to explain the sale. next she walks 25 meters, West at 0.5m/sec with 180 seconds explaing. to reach her 4th house she walks 16meters East at 0.5 with 180 seconds to complete her sale. realizing she is out of time she jogs 18meters East at 1.5m/sec to her 5th customers house completes her sale in 180 seconds, and runs 16meters, South at 2m/sec to her 6th and final house where after 180 seconds she barely makes her deadline.
total distance = 107m/sec
total time=134sec (from her home to house 6)
total time required to give sales and collect orders= 1808*6+134=1214
average speed=.88m/sec
net x =8
net y=-15
we also had to draw all the vectors on graph paper! |