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Date Posted: 07:34:42 03/26/01 Mon
Author: panda
Author Host/IP: NoHost / 203.168.170.22
Subject: dont know

Susan takes part in a 100m race at an athletic meet.She starts at time t=0
and accelerates at a uniform rate of 1.6ms^-2
for 5s.She then maintains a uniform speed afterwards and reaches the
finishing line at t=15s.
Find the average speed for the whole journey.
應該用S=vt黎計,但係我想問問點解唔可以用(v+u)/2?我地幾時可以用S=vt,同幾時先可以用(v+u)/2 to find the average speed/velocity?

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