- #1
drwillis
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Homework Statement
Two physics students are trying to detemine the
instantaneous speed of a bicycle 5.0 m from the
start of a 1000 m sprint. It takes 4s to travel 10m. What is the instananeous speed at the 5m mark? acceleration is constant.
(5m mark is 10 m as they start at -5m)
X=Distance
U=initial speed (U= 0m/s)
Note. This is the first thing I've tried since joining year 11 so i am quite a novice and may have just made a stupid error
Homework Equations
X=ut+1/2at^2
V=U+at
The Attempt at a Solution
x=ut+1/2at^2
10=(1/2).(a).(16)
10=8.a
a=1.25
V=u+at
V=(1.25)(4)
V=5m/s
But the answers say it 3.5m/s.