OneDimensionalKinematics
Problen 1
Startingfrom rest, a cm accelerates
at a constant4.00 m/s2for a distanceof425 m. The
car is then shiftedinto neutraland slowsdown at a ruteof 2.25 m/s2.How much time
elaosesbetweenwhenthe cm startsandwhen it stoos?
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v= ?
Q . oD t/go
v-= ;:.- AoC*-
q= t4.oonfs^
v=
t=7
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v
?4
_--_-_--=-+
Q = r/o+ al
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V = O.q/r
q= -).a,5m/s)
a,\
= o\qx
=
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r
Vo = 5 s.?nfs
l
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L! q
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Yo = Ot"r/ S
t=
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Yg
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2'' 'uA^-L tt' '^z
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)9" c,1
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t
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5.1l
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= 14.t-s I5.\s
"
t= 4o"Es
---t
t
C=
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a
J>.1 9
Problem2
A hot-air balloon is rising upwardwith a constantspeedof 3.50 m/s. Whenthe balloon is
I 15m abovethe grormd,a passengertrying to takea pictwe accidentallydropshis cell
phoneover the sideof the balloon.Ignoring air resistance,how muchtime elapsesbefore
the cell phonehits the ground?
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q = -4.1o nls^
6 = 3.so nls
c:
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t'\r.E-:
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----
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